WorksheetsAP Statistics Name that Test Review of Inference
Total questions: 11
Worksheet time: 22mins
Name
Class
Date
1.
A random sample of 44 individuals with a B.S. degree in accounting who had started with a “Big Eight” accounting firm and subsequently changed jobs resulted in a mean time to change of 35.02 months and a standard deviation of 18.94 months. At the 0.05 level of significance, is there sufficient evidence to support the claim that true mean time to change exceeds 24 months.
a)
1 Sample z Test
b)
1 Sample t Test
c)
1 Proportion z Test
d)
x-sq Test
2.
A study of zinc-deficient mothers was conducted to determine whether zinc supplementation during pregnancy results in babies with increased weights at birth. Sample data are listed below. The weights were measured in grams. Using a 0.05 significance level, is there sufficient evidence to support the claim that zinc supplementation does result in increased birth weights?
a)
1 Proportion z Test
b)
x-sq Test
c)
1 Sample t Test
d)
2 Sample t Test
3.
A study of sport and compact car colors shows that 15.2% are green, 14.4% are white, 19.8% are red, 11.2% are black and 39.4% are other colors (based on data from DuPont Automotive as reported in USA Today). When 100 trucks and vans are randomly selected, it is found that 16 are green, 24 are white, 16 are red, none are black, and 44 are other colors. Is there sufficient evidence to support the claim that the color distribution for trucks and vans is different from the color distribution for sport and compact cars? Use a 0.05 level of significance.
a)
x-square Test
b)
x-square GOF Test
c)
1 Proportion z test
d)
2 Proportion z test
4.
A student organization uses the proceeds from a particular soft drink dispensing machine to finance its activities. The price per can had been $.50 for a long time, and the average daily revenue during that period $50.00. The price was recently increased to $.60 per can. A random sample of n = 20 days subsequent to the price increase yielded a sample average revenue and sample standard deviation of $47.30 and $4.20, respectively. Does this data suggest that the true average daily revenue has decreased from its value prior to the price increase? Use a .05 level of significance.
a)
2 Proportion Z Test
b)
1 Proportion Z Test
c)
2 Sample T Test
d)
1 Sample T Test
5.
Clinical test of allergy drug Seldane yielded results summarized in the accompanying table. At the 0.05 significance level, test the claim that the occurrence of headaches is independent of the group (Seldane, Placebo, control). Based on these results, should Seldane users be concerned about getting headaches?
a)
Chi-Square Goodness of Fit
b)
Chi-Square Test for Association/ Independence
c)
Chi Square Test of Homogeneity
d)
2 Sample Z Test
6.
Twelve Dozenol tablets are tested for solubility before and after being stored for one year. The indexes of solubility are given in the table below.
Test the claim that the solubility is greater after being stored for one year.
Hint - Is this Matched Pairs Design?
Test the claim that the solubility is greater after being stored for one year.
Hint - Is this Matched Pairs Design?
a)
1 Sample T Test
b)
2 Sample T Test
c)
Chi-Square Test
d)
1 Sample Z Test
7.
A test question is considered good if it discriminates between unprepared and prepared students. The first question on a test was answered correctly by 23 of 50 unprepared students and by 45 of 80 prepared students. At the 0.05 significance level, test the claim that the proportion of unprepared students who answer the question correctly is less than the proportion of prepared students who answer it correctly.
a)
2 Proportion z Test
b)
2 Sample z Test
c)
1 Proporiton z Test
d)
1 Sample z Test
8.
The article “Caffeine Knowledge, Attitudes and Consumption in Adult Women” reported the following summary data on daily caffeine consumption of a random sample of adult women: n = 47, x̄ = 215 mg, and s = 235 mg. Suppose that it had previously been believed that the mean consumption of caffeine was at most 200 mg. Does the given data contradict this prior belief? Use a 0.01 level of significance.
a)
Chi Square
b)
1 Sample T Test
c)
1 Sample Z Test
d)
Chi Square GOF
9.
Academic dishonesty continues to be a problem on college and university campuses. One form of dishonesty is to look at notes during an exam or quiz. One study reported that in a random sample of 480 students, 124 said they had looked at notes during an exam or quiz. At the 0.05 level of significance is there sufficient evidence to conclude that more than 20% of all students engage in this particular form of academic dishonesty.
a)
Chi-Square GOF
b)
1 Sample z Test
c)
1 Proportion t Test
d)
1 Proportion z Test
10.
A sociologist conducts a study to determine if there is a relationship between cheating on exams and socioeconomic status. A random sample of 750 high school students yields the following results. What is the conclusion about cheating and socioeconomic status at the 5% significance level?
a)
Chi Square
b)
Chi Square GOF
c)
2 Proportion z Test
d)
4 Proportion z Test
11.
A pharmaceutical firm would like to show that taking a particular mixture of vitamins and natural herbs would raise the IQ of a teenager. A sample of 15 teenagers is chosen, and their IQs are measured before and after taking the vitamin-herb mixture for 1 year. The individual results are as follows. The pharmaceutical firm claims that after taking the vitamin-herb mixture, teenagers have a higher than average IQ. (Average IQ is 100) Do the data support their conclusion?
a)
1 Sample t Test
b)
2 Sample t Test
100 %
