The purpose of a control chart is to eliminate common cause variation

Question:R chart is a control chart used to monitor a process mean.

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Question:The purpose of a control chart is to eliminate common cause variation.

Question:If an economist wishes to determine whether there is evidence that average family income in a community exceeds $25,000

Question:Which of the following would be an appropriate null hypothesis?

Question:It is possible to directly compare the results of a confidence interval estimate to the results obtained by testing a null hypothesis if

Question:Common causes of variation represent variation due to the inherent variability in the system.

Question:For a given level of significance, if the sample size is increased, the power of the test will increase.

Question:A process is said to be out of control if

Question:How many Kleenex should the Kimberly Clark Corporation package of tissues contain? Researchers determined that 60 tissues is the average number of tissues used during a cold. Suppose a random sample of 100 Kleenex users yielded the following data on the number of tissues used during a cold: X-bar = 52, s = 22.

Using the sample information provided, calculate the value of the test is

Question:A student claims that he can correctly identify whether a person is a business major or an agriculture major by the way the person dresses. Suppose in actuality that he can correctly identify a business major 87% of the time, while 16% of the time he mistakenly identifies an agriculture major as a business major. Presented with one person and asked to identify the major of this person (who is either a business or agriculture major), he considers this to be a hypothesis test with the null hypothesis being that the person is a business major and the alternative that the person is an agriculture major.

What would be a Type II error?

Question:The larger the p value, the more likely one is to reject the null hypothesis.

Question:An entrepreneur is considering the purchase of a coin-operated laundry. The present owner claims that over the past 5 years, the average daily revenue was $675 with a standard deviation of $75. A sample of thirty days reveals a daily average revenue of $625. If you were to test the null hypothesis that the daily average revenue was $675, which test would you use?

Question:The symbol for the power of a statistical test is

Question:A factory supervisor is concerned that the time it takes workers to complete an important production task (measured in seconds) is too erratic and adversely affects expected profits. The supervisor proceeds by randomly sampling 5 individuals per hour for a period of 10 hours. The sample mean and range for each hour are listed below.

Suppose the supervisor constructs an X-bar chart to see if the process is in-control. The upper and lower control limits for the R chart are approximately UCL = 8.49 and LCL = 32.03 

The process is in control.

Question:The control chart

Question:The power of a statistical test is

Question:How many Kleenex should the Kimberly Clark Corporation package of tissues contain? Researchers determined that 60 tissues is the average number of tissues used during a cold. Suppose a random sample of 100 Kleenex users yielded the following data on the number of tissues used during a cold: X-bar = 52, s = 22. 

Question:A student claims that he can correctly identify whether a person is a business major or an agriculture major by the way the person dresses. Suppose in actuality that he can correctly identify a business major 87% of the time, while 16% of the time he mistakenly identifies an agriculture major as a business major. Presented with one person and asked to identify the major of this person (who is either a business or agriculture major), he considers this to be a hypothesis test with the null hypothesis being that the person is a business major and the alternative that the person is an agriculture major.

What would be a Type I error?

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Question:The owner of a local night club has recently surveyed a random sample of n = 250 customers of the club. She would now like to determine whether the mean age of her customers is over 30. If so, she plans to alter the entertainment to appeal to an older crowd. If not, no entertainment changes will be made.

Suppose she found that the sample mean was 30.45 years and the sample standard deviation was 5 years. What is the p value associated with the test statistic?

Question:An appliance manufacturer claims to have developed a compact microwave oven that consumes an average of no more than 250 W. From previous studies, it was determined that power consumption for microwave ovens is normally distributed with a standard deviation of 15 W. A consumer group has decided that the claim is suspicious and wishes to demonstrate that it is false. They take a sample of 20 microwave ovens and find that they consume an average of 257.3 W.

The null hypothesis will be rejected.

Question:A political pollster randomly selects a sample of 100 voters each day for 8 successive days and asks how many will vote for the incumbent. The pollster wishes to construct a p chart to see if the percentage favoring the incumbent candidate is too erratic.


The numerical value of the center line for the p chart is .56

Question:The principal focus of the control chart is the attempt to separate special or assignable causes of variation from common causes of variation. What cause of variation can be reduced only by changing the system?

Question:An appliance manufacturer claims to have developed a compact microwave oven that consumes an average of no more than 250 W. From previous studies, it was determined that power consumption for microwave ovens is normally distributed with a standard deviation of 15 W. A consumer group has decided that the claim is suspicious and wishes to demonstrate that it is false. They take a sample of 20 microwave ovens and find that they consume an average of 257.3 W.

For a test with a level of significance of 0.05, the critical value would be

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Question:How many Kleenex should the Kimberly Clark Corporation package of tissues contain? Researchers determined that 60 tissues is the average number of tissues used during a cold. Suppose a random sample of 100 Kleenex users yielded the following data on the number of tissues used during a cold: X-bar = 52, s = 22.

State the null and alternative hypotheses if the researcher wishes to determine if the number of tissues used during a cold is less than 60.

Question:An appliance manufacturer claims to have developed a compact microwave oven that consumes an average of no more than 250 W. From previous studies, it was determined that power consumption for microwave ovens is normally distributed with a standard deviation of 15 W. A consumer group has decided that the claim is suspicious and wishes to demonstrate that it is false. They take a sample of 20 microwave ovens and find that they consume an average of 257.3 W.

The p value of the test is approximately 0.0148

Question:Which of the following are not part of the Shewhart cycle?

Question:How many Kleenex should the Kimberly Clark Corporation package of tissues contain? Researchers determined that 60 tissues is the average number of tissues used during a cold. Suppose a random sample of 100 Kleenex users yielded the following data on the number of tissues used during a cold: X-bar = 52, s = 22. 

Question:If we are performing a two-tailed test of whether µ = 100, the probability of detecting a shift of the mean to 105 will be ________ the probability of detecting a shift of the mean to 110.

Question:A political pollster randomly selects a sample of 100 voters each day for 8 successive days and asks how many will vote for the incumbent. The pollster wishes to construct a p chart to see if the percentage favoring the incumbent candidate is too erratic.

The numerical value of the lower control limit for the p chart is .709

Data is missing [But you may mark (b) as the answer]

Question:If a researcher rejects a true null hypothesis, she has made a Type II error.

Question:A Type I error is committed when

Question:An appliance manufacturer claims to have developed a compact microwave oven that consumes an average of no more than 250 W. From previous studies, it was determined that power consumption for microwave ovens is normally distributed with a standard deviation of 15 W. A consumer group has decided that the claim is suspicious and wishes to demonstrate that it is false. They take a sample of 20 microwave ovens and find that they consume an average of 257.3 W.

For this test to be valid, it is necessary that the power consumption for microwave ovens has a normal distribution.

Question:It is not possible for the X-bar chart to be out-of-control when the R chart is in control.

Question:Changes in the system to reduce common cause variation are the responsibility of management.

Question:Once the control limits are set for a control chart, one attempts to

Question:A factory supervisor is concerned that the time it takes workers to complete an important production task (measured in seconds) is too erratic and adversely affects expected profits. The supervisor proceeds by randomly sampling 5 individuals per hour for a period of 10 hours. The sample mean and range for each hour are listed below.

Suppose the supervisor constructs an X-bar chart to see if the process is in-control. What is the center line of the chart?

Question:Variation signaled by individual fluctuations or patterns in the data is called

Question:A factory supervisor is concerned that the time it takes workers to complete an important production task (measured in seconds) is too erratic and adversely affects expected profits. The supervisor proceeds by randomly sampling 5 individuals per hour for a period of 10 hours. The sample mean and range for each hour are listed below.


Suppose the sample mean and range data were based on 6 observations per hour instead of 5. How would this change affect the lower and upper control limits of an R chart?

Question:Which of the following is not one of Deming's fourteen points?

Question:Variation due to the inherent variability in a system of operation is called

Question:Which of the following statements is not true about the level of significance in a hypothesis test?

Question:The owner of a local night club has recently surveyed a random sample of n = 250 customers of the club. She would now like to determine whether the mean age of her customers is over 30. If so, she plans to alter the entertainment to appeal to an older crowd. If not, no entertainment changes will be made.

The appropriate hypotheses to test are

Question:An appliance manufacturer claims to have developed a compact microwave oven that consumes an average of no more than 250 W. From previous studies, it was determined that power consumption for microwave ovens is normally distributed with a standard deviation of 15 W. A consumer group has decided that the claim is suspicious and wishes to demonstrate that it is false. They take a sample of 20 microwave ovens and find that they consume an average of 257.3 W.

The appropriate hypotheses to determine if the manufacturer's claim appears reasonable are

Question:Special or assignable causes of variation are signaled by individual fluctuations or patterns in the data.

Question:

Question:A factory supervisor is concerned that the time it takes workers to complete an important production task (measured in seconds) is too erratic and adversely affects expected profits. The supervisor proceeds by randomly sampling 5 individuals per hour for a period of 10 hours. The sample mean and range for each hour are listed below.


Suppose the supervisor constructs an R chart to see if the variability in collection times is in-control. What is the center line of this R chart?

Question:An appliance manufacturer claims to have developed a compact microwave oven that consumes an average of no more than 250 W. From previous studies, it was determined that power consumption for microwave ovens is normally distributed with a standard deviation of 15 W. A consumer group has decided that the claim is suspicious and wishes to demonstrate that it is false. They take a sample of 20 microwave ovens and find that they consume an average of 257.3 W.

The value of the test statistic is ________

Question:A Type II error is committed when

Question:

Question:A factory supervisor is concerned that the time it takes workers to complete an important production task (measured in seconds) is too erratic and adversely affects expected profits. The supervisor proceeds by randomly sampling 5 individuals per hour for a period of 10 hours. The sample mean and range for each hour are listed below.


Suppose the supervisor constructs an R chart to see if the variability in collection times is in-control. The upper and lower control limits for the R chart are approximately UCL = 43.13 and LCL = 5.13 

The process is in control.