QNT561 QNT 561 Week 2 Practice Quiz Help

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1. A random sample of 91 observations produced a mean xbar  = 25.4 and a standard deviation s = 2.6,           a.  Find a 95% confidence interval   for u    b.  Find a 90% confidence intervalue for  u       c.  Find a 99% confidence interval for u
2. Health  care workers who use latex gloves with glove powder on a daily basis are particularly susceptible to developing a latex allergy  Each in a sample of 43 hospital employees who were diagnosed with a latex allergy  based on a skin-prick test
3. Each child in a sample of 62 low-income children was  administered a language and communication exam. The sentence complexity scores had a mean of 7.63 and standard deviation of 8.94  Complete parts   a through d
4. The random sample  shown below was selected from a normal distribution.  Complete parts a and b
5. Periodically a town water department tests the drinking water of homeowners for contaminants  such as lead.  The lead levels in water specimens collected for a sample of 10 residents
6. A random sample of size n = 100  yielded p = 0.50.   
   a. is the sample size large enough
   b. Construct a 95% confidence interval  
   c.  Interpret the 95% confidence interval
   d. Explain what is meant by the phrase “95% confidence interval:
7. A newspaper reported 80% of the people say that some coffee shops are overpriced. The source of this information was a telephone survey of 100 adults   Complete parts a to d.
8. An accounting firm annually  monitors a certain mailing service’s  performance. One parameter of interest is the percentage of mail delivered on time.
9. Suppose you are given a data set that classifies each sample into one of the four categories  A, B, C,  D
10. In one university language professors incorporated a 10-week extensive reading program to improve students Japanese reading comprehension, The professor collected 253 books originally written
11. Graph the relative frequency histogram for the 600 measurements summarized in the relative  frequency table to the right.
12. Five banks have been ranked by the amount charged to credit and debit cards issued by the banks.  The table to the right gives the total amount charged in 2007 for the top ranked banks.
13. Compare the z scores to decide which of the x values below lie the greatest distance above the mean and the greatest distance below the mean
14. Consider the horizontal plot shown to the right .   a. What is the median, b  What are upper and lower quartile, c.  what is interquartile range
15. Educators are constantly evaluating the efficacy of public schools in the education and training of students
16. The mean gas mileage for a hybrid car is 56 miles per gallon. Suppose that the gasoline mileage is approximately normally distributed with a standard deviation of 3.3 miles per gallon