Deck 18: Hypothesis Testing: Means and Proportions

Question 1

What F-value do you find from this table? a) 0.75 b) 0.9 c) 1.0 d) 1.6

Answer 1

D

Question 2

A good descriptive statistic of measuring the strength of association is to measure "Rho," which is the proportion of variance accounted for in the sample data.

Answer 2

True

Question 3

In a hypothesis test when alpha is pre-specified, the researcher is trying to determine "Is the probability of what has been observed lesser than alpha?" and then decide accordingly.

Answer 3

True

Question 4

What is the value of rho from these data? a) 0.25 b) 0.333 c) 0.42 d) 0.5

Question 5

To measure the difference between means or the difference between independent sample proportions, one would probably use which statistical technique? a) chi-square test b) sign test c) F-test d) t-test

Question 6

An interaction effect means that the impact of a specific treatment will not be the same for each condition of the other treatment in the ANOVA analysis.

Question 7

The p-value is independent of the sample size.

Question 8

In an ANOVA test, if the "between-treatment variance" is lesser than the "within-treatment variance," then the null hypothesis can be rejected.

Question 9

When the sample statistic falls within the critical values, it proves that the null hypothesis is true.

Question 10

In an ANOVA test, "between-treatment variance" corresponds to the variance in the response variable for different treatments.

Question 11

The ANOVA table is a conventional way to present a hypothesis test regarding the difference between several means.

Question 12

What was the unexplained variation in this study? a) 80 b) 160 c) 340 d) 640

Question 13

What is the degrees of freedom for the explained variation? a) 1 b) 8 c) 9 d) none of the above

Question 14

The p‐value generally is sensitive to sample size, in that if the sample size increases, the p‐value usually will become larger.

Question 15

If the F-value from this table was .19 and the table value from the back of the book was 3.89, you would a) accept the null hypothesis of independence b) reject the null hypothesis of independence c) accept the null hypothesis that the explained variance = 0 d) reject the null hypothesis that the explained variance = 0

Question 16

In one-way ANOVA, we primarily look to determine whether or not there are any statistically significant differences between the treatment means

Question 17

In an ANOVA test, "within-treatment variance" corresponds to the variance in the response variable for a given treatment.

Question 18

The p-value can be defined as the largest significance level at which we would accept the null hypothesis.

Question 19

The greater the p-value, the higher is the researcher's confidence in the research findings.

Question 20

How many subjects participated in this experiment?

A) 16
B) 17
C) 18
D) 19

Question 21

The rejection rule is

A)reject the null hypothesis in favor of the alternative hypothesis
B)fail to reject the null and conclude that the product meets specifications.
C)inadequate sample size and hence conduct a retest.
D)standard deviation of the sample to be calculated.
Use the following information for questions 12 through 14.
Jack Enterprises Inc.is a laser printer manufacturer.The board of Jack Enterprises wants to see a perceptible improvement in the quality of the laser printers and specify a defect free production rate of 0.95.The quality assurance manager incorporates some
Changes in the assembling process and checks a random sample of 225 printers.She finds that only 87% of the printers are defect free.She wants to test the hypothesis that 95% of the printers manufactured by the company are defect free.The significance level
Has been specified at 0.05.

Question 22

There are ______ degrees of freedom associated with a sample variance a) n b) n-1 c) n-2 d) n₁- + n₂ - 2

Question 23

The F-value you would look up in the back of the book would be found with degrees of freedom F ____, _____. a) 2, 12 b) 2, 14 c) 12, 2 d) 14, 2

Question 24

The limits of the acceptance region are

A).922, 0.978)
B).94, 0.97)
C).86, 0.91)
D).93, 0.98)

Question 25

Standard error of the proportions is

A)0.0145
B)0.02
C)-0.0145
D)0.308

Question 26

The hypothesized value of the defect free printers is

A)0.87
B)0.13
C)0.95
D)none of the above.