Exam 17: Hypothesis Testing

A) Hybrid cars get better gas mileage than traditional cars
B) There is a difference in the gas mileage of cars and trucks
C) There is no difference in gas mileage among two-door and four-door vehicles
D) There is a relationship between the number of miles to one's job and the gas mileage associated with his or her chosen car
E) All of the above are one-tailed tests

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A) increases
B) decreases
C) stays the same
D) is rejected
E) is accepted

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A) The variability attributable to a treatment is compared to the variability arising from random error
B) The probability of making a type I error is compared to the probability of making a type II error
C) The critical F is compared to the critical t
D) The standard deviation for each group is subtracted from the mean of all groups
E) None of the above

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A) .05
B) .10
C) .25
D) .90
E) .95

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A) Post hoc comparisons are completed as a part of the initial test
B) It requires an assumption of normality
C) It examines possible interaction effects among two independent factors
D) It examines possible interaction effects among two or more dependent variables
E) It allows an examination of ordinal data

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A) Test of differences in the percent of men and women who are or are not members of Greek organizations on campus
B) Test of the average incomes of subscribers of Southern Living and Better Homes and Gardens
C) Test of whether the mean salary of professors at Metro University is higher than the national average for university professors
D) Test of whether a change occurred in the proneness for heart disease among people who switched to a diet high in fish
E) Test of differences in ad recall among three experimental groups (each of which saw a different advertisement) and a control group

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A) Classical, Bayesian
B) Inductive, deductive
C) Bayesian, classical
D) Descriptive, exploratory
E) Exploratory, descriptive

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A) Compared to the normal distribution, the t distribution has more area in the tails and less in the center.
B) As the number of degrees of freedom increases, the t distribution approaches the normal distribution.
C) The t distributions are skewed to the left.
D) The population variance is unknown and is estimated by the sample variance s².
E) As the sample size increases beyond 120, the t and Z distributions are indistinguishable.

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A) A t-test is used to conclude that men consume more hamburgers than women
B) A chi-square test is used to conclude that there is a difference in type of living quarters by class status
C) Using a one-way ANOVA, significant differences in ad recall are found between three experimental groups and one control group
D) A Z test indicates that the national average of the number of soft drinks consumed in the US exceeds that of France
E) All of the above can use an a priori contrast

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A) Type I error
B) Type II error
C) Beta error
D) Standard error
E) Demand error

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A) Hamburger consumption differs among men and women
B) Men consume more hamburgers than women
C) Women are more concerned with the health consequences associated with eating hamburgers than are men
D) There is no difference in hamburger consumption among men and women
E) All of the above are two-tailed tests

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A) Type I error
B) Two-tailed error
C) Type II error
D) One-tailed error
E) Parametric significance

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A null hypothesis is a statement of the ...

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A) ANOVA
B) X²
C) F ratio
D) Z test
E) Scheffe's S

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A) There is no relationship between income and food expenditures
B) There is a relationship between income and food expenditures
C) As income increases, food expenditures increase
D) As income decreases, the percentage of income spent on food increases
E) None of the above

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A) H0: π≤ 36
B) HA: π> 36
C) H0: µ = 36
D) HA: µ≠ 36
E) HA: µ> 36

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A) Finding a guilty person guilty
B) Finding a guilty person not guilty
C) Finding an innocent person not guilty
D) Finding an innocent person guilty
E) None of the above

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A) p value <
B) p value >
C) p value =
D) p value cannot be determined
E) p value is unrelated to hypothesis testing

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