Statistics: MCQs and True/False

profileAsma
 (Not rated)
 (Not rated)
Chat

Question 1

The alternate hypothesis

 

is accepted if the null hypothesis is rejected

 

Will always contain the equal sign

 

Tells the value of the sample mean

 

None of the above

 

Question 2

"If the null hypothesis is mean (mu) equal to or greater than 200 and the alternate hypothesis states that mean (mu) is less than 200, then, a two-tail test is being conducted"

 True False

Question 3

"Three new colors have been proposed for the Jeep Grand Cherokee vehicle. They are silvered-blue, almond, and willow green. The null hypothesis for a goodness-of-fit test would be"

 

will green is preferred over the other colors.

 

that there is no preference between the colors.

 

Any one color is preferred over the other colors.

 

impossible to determine.

 

Question 4

Suppose you compare the mean of raw data and the mean of the same raw data grouped into a frequency distribution. These two means will be

 

Exactly equal

 

the same as the median

 

The same as the geometric mean

 

Approximately equal

 

Question 5

We wish to estimate the population proportion. We want to be 95 percent confident of our results and we want the estimate to be within 0.01 of the population parameter. No estimate of the population proportion is available. What value should we use for p?

 

1.96

 

0.01

 

0.5

 

"We cannot complete the problem, we need more information"

 

Question 6

"If a confidence interval for the difference between a pair of treatment means includes 0, then there is no difference in the pair of treatment means."

True False

Question 7

In correlation analysis

 

we consider several independent variable

 

we study the strength of the association between two variables

 

we consider the intercept with the y-axis

 

None of the above

Question 8

The chi-square goodness-of-fit test can be applied if there are equal or unequal expected frequencies.

 True False

Question 9

Suppose we select 6 observations from each of three treatments. The appropriate degrees of freedom for the F distribution are

 

3 and 6

 

2 and 6

 

2 and 15

 

None of the above

Question 10

Under which of the following conditions will the computed value of F be negative?

 

When there is no difference in the treatment means

 

When there is no difference in the block means

 

When the SS total is larger than SST

 

F cannot be negative

 

 

 

 

 

 

 

 

Question 11

A Type I error is

 

the correct decision

 

a value determined from the test statistic

 

rejecting the null hypothesis when it is true

 

accepting the null hypothesis when it is false.

Question 12

"Suppose the least squares regression equation is Y = 1202 + 1,133X. When X = 3, what does Y equal?"

 

"5,734"

 

"8,000"

 

"4,601"

 

"4,050"

Question 13

Which of the following are correct statements regarding the goodness-of-fit test?

 

Data may be of nominal scale.

 

Population must be normal.

 

All the expected frequencies must be equal.

 

All of the above.

Question 14

The level of significance

 

is frequently 0.05 or 0.01

 

can be any value between 0 and 1

 

is the likelihood of rejecting the null hypothesis when it is true.

 

All of the above

Question 15

"A large department store examined a sample of the 18 credit card sales and recorded the amounts charged for each of three types of credit cards: MasterCard, Visa and Discover. Six MasterCard sales, seven Visa; and five Discover sales were recorded. The store used ANOVA to test if the mean sales for each credit card were equal. What are the degrees of freedom for the F statistic?"

 

"18 in the numerator, 3 in the denominator"

 

"3 in the numerator, 18 in the denominator"

 

"2 in the numerator, 15 in the denominator"

 

"6 in the numerator, 15 in the denominator"

 

 

Question 16

A t test is used to test the significance of the coefficient of correlation.

 True False

 

 

 

Question 17

"For a one-tailed test using the 0.05 level of significance, the critical value for the z test is 1.645, but for the 5 it is 1.96"

True False

Question 18

"The term ""Treatment"" refers to"

 

a source of variation

 

the numerator degrees of freedom

 

the variation within the cells

 

None of the above

Question 19

"Trying to predict weekly sales with a standard error of estimate of $1,955, we would conclude that 68 percent of the predictions would not be off more than $1,955, 95 percent would not be off by more than $3,910, and 99.7 percent would not be off by more than $5,865."

 True False

Question 20

In a contingency table

 

the number of rows must be the same as the number of columns

 

a variable is classified according to two criteria.

 

there must be at least 10 observations in each cell

 

All of the above

 

    • 11 years ago
    Solution
    NOT RATED

    Purchase the answer to view it

    blurred-text
    • attachment
      question_2.docx