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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

what is the sample size if the degree of freedom is 25?
Arthur Reply
26..
friend
how to understand statistics
Edwin Reply
you are working for a bank.The bank manager wants to know the mean waiting time for all customers who visit this bank. she has asked you to estimate this mean by taking a sample . Briefly explain how you will conduct this study. assume the data set on waiting times for 10 customers who visit a bank. Then estimate the population mean. choose your own confidence level.
Halpha Reply
what marriage for 10 years
Ambaye Reply
fit a least square model of y on x ? what is the regression coefficient ? x : 2 3 6 8 9 10 y : 5 6 7 10 8 11
Nayab Reply
how can we find the expectation of any function of X?
Jennifer
I've been using this app for some time now. I'm taking a stats class in college in spring and I still have no idea what's going on. I'm also 55 yrs old. Is there another app for people like me?
Tamala
Serious
Hamza
yes I am. it's been decades since I've been in school.
Tamala
who are u
zaheer
is there a private chat we can do
Tamala
hello how can I get PDF of solutions introduction mathematical statistics ( fourth education) who can help me
ahssal
can anyone help me
Halim
what is probability
zaheer Reply
simply probability means possibility.. definition:Probability is a measure of the likelihood of an event to occur.
laraib
fit a least square model of y on x ? what is the regression coefficient ? x : 2 3 6 8 9 10 y : 5 6 7 10 8 11
Nayab
classification of data by attributes is called
Yamin Reply
qualitative classification
talal
tell me details about measure of Dispersion
Halim
Following data provided Class Frequency less than 10 10-20 5 15 10-30 25 12 40 and above Which measure of central tendency would you compute and why?
Nija Reply
a box contains a few red and a few blue balls.one ball is drawn randomly find the probability of getting a red ball if we know that there are 30 red and 40 blue balls in the box
harish Reply
3/7
RICH
Total=30+40=70 P(red balls) =30/70 Therefore the answer is 3/7
Anuforo
define transport statistical unit
Dennis Reply
describe each transport statistical unit
Dennis
explain uses of each transport statistical unit
Dennis
identify various transport statistical units with their example
Dennis
I didn't understand about Chi- square.
Esayas Reply
explain the concept of data analysis and data processing
Kim Reply
the following data represent the number of pop up advertisement received by 10 families during the past month.calculate the mean number of advertisement received by each family during month.43,37,35,30,41,23,33,31,16,21
ejaz Reply
mean=43+37+35+30+41+23+33+31+16/10 =310/10 =31
Anuforo
43+37+35+30+41+23+33+31+16 divided by 10 =310/10 =31
Anuforo
=310/10 =31
Anuforo
the following data represent the number of pop up advertisement received by 10 families during the past month.calculate the mean number of advertisement received by each family during month.43,37,35,30,41,23,33,31,16,21
ejaz Reply
In a recent survey of nurses in Region II, it was found out that the average monthly net income of nurses is Php 8,048.25. Suppose a researcher wants to test this figure by taking a random sample of 158 nurses in Region II to determine whether the monthly income has changed. Supposed further that th
Sweet 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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