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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

pls I need understand this statistics very will is giving me problem
Bolanle Reply
Sixty-four third year high school students were given a standardized reading comprehension test. The mean and standard deviation obtained were 52.27 and 8.24, respectively. Is the mean significantly different from the population mean of 50? Use the 5% level of significance.
Daryl Reply
No
Ariel
how do I find the modal class
Bruce Reply
look for the highest occuring number in the class
Kusi
the probability of an event occuring is defined as?
James Reply
The probability of an even occurring is expected event÷ event being cancelled or event occurring / event not occurring
Gokuna
what is simple bar chat
Toyin Reply
Simple Bar Chart is a Diagram which shows the data values in form of horizontal bars. It shows categories along y-axis and values along x-axis. The x-axis displays above the bars and y-axis displays on left of the bars with the bars extending to the right side according to their values.
Muhammad
statistics is percentage only
Moha Reply
the first word is chance for that we use percentages
muhammad
it is not at all that statistics is a percentage only
Shambhavi
I need more examples
Luwam Reply
how to calculate sample needed
Jim Reply
mole of sample/mole ratio or Va Vb
Gokuna
how to I solve for arithmetic mean
Joe Reply
Yeah. for you to say.
James
yes
niharu
how do I solve for arithmetic mean
Joe Reply
please answer these questions
niharu
add all the data and divide by the number of data sets. For example, if test scores were 70, 60, 70, 80 the total is 280 and the total data sets referred to as N is 4. Therfore the mean or arthritmatic average is 70. I hope this helps.
Jim
*Tan A - Tan B = sin(A-B)/CosA CosB ... *2sinQ/Cos 3Q = tan 3Q - tan Q
Ibraheem Reply
standard error of sample
Umar Reply
what is subjective probability
Avela Reply
how to calculate the Steadman rank correlation
David
what is sampling? i want to know about the definition of sampling.
anup Reply
what is sample...?
Abdul Reply
In terms of Statistics or Research , It is a subset of population for measurement.
Da

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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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