0.2 Practice tests (1-4) and final exams  (Page 34/36)

14 . c. Iris

15 . c. Student's t

16 . b. is left-tailed.

17 . c. cluster sampling

18 . b. median

19 . a. the probability that an outcome of the data will happen purely by chance when the null hypothesis is true.

20 . d. stratified

21 . b. 25

22 . c. 4

23 . a. (1.85, 2.32)

24 . c. Both above are correct.

25 . c. 5.8

26 . c. 0.6321

27 . a. 0.8413

28 . a. (0.6030, 0.7954)

29 . a. $N\left(145,\frac{14}{\sqrt{10}}\right)$

30 . d. 3.66

31 . b. 5.1

32 . a. 13.46

33 . b. There is a strong linear pattern. Therefore, it is most likely a good model to be used.

34 . b. ${{\mathrm{Chi}}^2}_3$ .

35 . d. 70

36 . b. There is sufficient evidence to conclude that the choice of major and the gender of the student are not independent of each other.

37 . a. ${\mathrm{Chi}}^2$ goodness-of-fit

Practice final exam 2

1 . A study was done to determine the proportion of teenagers that own a car. The population proportion of teenagers that own a car is the:

1. statistic.
2. parameter.
3. population.
4. variable.

Use the following information to answer the next two exercises:

2 . The box plot for the data is:

3 . If six were added to each value of the data in the table, the 15 ^th percentile of the new list of values is:

1. six
2. one
3. seven
4. eight

Use the following information to answer the next two exercises: Suppose that the probability of a drought in any independent year is 20%. Out of those years in which a drought occurs, the probability of water rationing is ten percent. However, in any year, the probability of water rationing is five percent.

4 . What is the probability of both a drought and water rationing occurring?

1. 0.05
2. 0.01
3. 0.02
4. 0.30

5 . Which of the following is true?

1. Drought and water rationing are independent events.
2. Drought and water rationing are mutually exclusive events.
3. None of the above

Use the following information to answer the next two exercises: Suppose that a survey yielded the following data:

6 . Suppose that one individual is randomly chosen. The probability that the person’s favorite pie is apple or the person is male is _____.

1. $\frac{40}{60}$
2. $\frac{60}{140}$
3. $\frac{120}{140}$
4. $\frac{100}{140}$

7 . Suppose H ₀ is: Favorite pie and gender are independent. The p -value is ______.

1. ≈ 0
2. 1
3. 0.05
4. cannot be determined

Use the following information to answer the next two exercises: Let’s say that the probability that an adult watches the news at least once per week is 0.60. We randomly survey 14 people. Of interest is the number of people who watch the news at least once per week.

8 . Which of the following statements is FALSE?

1. X ~ B (14 0.60)
2. The values for x are: {1 ,2 ,3 ,... ,14}.
3. μ = 8.4
4. P ( X = 5) = 0.0408

9 . Find the probability that at least six adults watch the news at least once per week.

1. $\frac{6}{14}$
2. 0.8499
3. 0.9417
4. 0.6429

10 . The following histogram is most likely to be a result of sampling from which distribution?

1. chi-square with df = 6
2. exponential
3. uniform
4. binomial

11 . The ages of campus day and evening students is known to be normally distributed. A sample of six campus day and evening students reported their ages (in years) as: {18, 35, 27, 45, 20, 20}. What is the error bound for the 90% confidence interval of the true average age?

1. 11.2
2. 22.3
3. 17.5
4. 8.7