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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 145 14 10

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. 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. 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:

value frequency
0 1
1 4
2 7
3 9
6 4

2 . The box plot for the data is:

This shows 4 boxplots, each over a number line scaled from 0 - 6. Boxplot (a) has left whisker from 0 to 2, box from 2 to 3, and right whisker from 3 to 6. Boxplot (b) has left whisker from 0 to 1, box from 1 to 4 with a dashed line at 3, and right whisker from 4 to 6. Boxplot (c) has box from 0 to 4 with a dashed line at 3 and right whisker from 4 to 6. Boxplot (d) has left whisker from 0 to 1, box from 1 to 3 with a dashed line at 2, and right whisker from 3 to 6.

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:

Favorite pie
gender apple pumpkin pecan
female 40 10 30
male 20 30 10

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. 40 60
  2. 60 140
  3. 120 140
  4. 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. 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?

This graph is an unlabeled histogram. The distribution is roughly symmetric. There is a single peak in the center of the graph and heights of bars decrease from that point toward each end of the graph.
  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

Questions & Answers

how they find mean population
Joy Reply
parts of statistics
Edwin Reply
what is a mean?
Onele Reply
given the sequence 128,64,32 find the 12th term of the sequence
Shehu Reply
12th number is 0.0625
Thangarajan
why do we use summation notation to represent set of observations
MICHAEL Reply
what is the potential outlier ?
Anik Reply
A pharmaceutical company claims that their pain reliever capsule is 70% effective. But a clinical test on this capsule showed 65 out of 100 effectiveness
jelly Reply
Part of statistics
charls Reply
how to find mean population
Dawit Reply
what is data value
Ravneet Reply
what is relative frequency
Adeyemi Reply
liner regression analysis
Swathy Reply
Proper definition of outlier?
Sumbal Reply
Extraordinary observation (too distant, high, low etc)
Petr Reply
What is outlier?
Sumbal Reply

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Source:  OpenStax, Introductory statistics. OpenStax CNX. May 06, 2016 Download for free at http://legacy.cnx.org/content/col11562/1.18
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