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Homework answers / question archive / 1) In order to determine the p-value, which of the following items of information is not needed? Select one: a

1) In order to determine the p-value, which of the following items of information is not needed? Select one: a

Statistics

1) In order to determine the p-value, which of the following items of information is not needed? Select one: a. The distribution of the test statistic b. Whether the test is a one- or two-tailed test c. The value of the test statistic d. The level of significance

2. The test marks from a randomly selected sample of 11 students are as follows:

34, 18, 67, 73, 67, 74, 66, 97, 76, 91, 36

Compute the coefficient of variation using Excel, and type in the box below your answer up to 2 digits after the decimal point (round up the third digit after the decimal point if it is greater than or equal to 5, and round it down if it is less than 5).

The coefficient of variation is :.....

 

3. The average mark of a class of 50 students is 75. There are 30 males and 20 females. The average mark of the male students is 73. What is the average mark of the female students?

 

Select one:

a. 65

b. 70

c. 78

d. 75

 

4. If the sample standard deviation for the number of members at each of 25 fitness clubs is 41, what is the variance for this sample?

 

Select one:

a. 625.

b. 6.4

c. 1681

d. 1.64

 

5. If A and B are mutually exclusive events with P(A) = 0.70, then

 

Select one:

a. P(B) will be zero only

b. P(B) can not be larger than 0.30

c. P(B) can take any value between 0 and 1

d. P(B) can be larger than 0.30

 

6. If P(A) = 0.65, P(B) = 0.85 and P(A B) =0.4, then

 

Select one:

a. P(B | A) = 0.9305.

b. P(B | A) = 0.6012.

c. P(B | A) = 0.6154

d. P(B | A) =  1.1000.

 

7. A positively skewed distribution has

 

Select one:

a. Mean<Median<Mode

b. Mean=Median=Mode

c. Mean>Median>Mode

d. Mode<Mean< median

 

8. If A and B are independent events, with P(A) = 0.25 and P(B) = 0.80, then P(A ∩ B) is:

 

Select one:

a. 0.5

b. 1.05

c. 0.2

d. None of these choices are correct.

 

9. A sample of data has a mean of 107, a median of 122 and a mode of 134. The distribution of the data is __________.

 

Select one:

a. negatively skewed

b. positively skewed

c. symmetric

d. bell-shaped

 

10. If P(A) = 0.45 and P(B) = 0.51, then P(A∩B) is:

 

Select one:

a. 0.90.

b. 0.40.

c. P(A∩B) cannot be determined due to incomplete given information.

d. 0.25.

 

11. A random experiment consists of five outcomes denoted by E1, E2, E3, E4, E5 with probabilities

 

P(E1) = 0.17,     P(E2) = 0.45,     P(E3) = 0.30,     P(E5) = 0.03. Then 

 

 

 

Select one:

a. P(E4) = 0.20.

b. P(E4) = 0.95

c. P(E4) = 1

d. P(E4) = 0.05

12. Given that Z is a standard normal random variable, P(Z > 2.10) is:

 

Select one:

0.0037.

.01786

0.0005

0.5037.

 

13.

 

 

 

14.

 

 

 

15. When national income decreases, expenditures on imports tend to decrease. Which of the following best describes this relationship?

 

Select one:

a. No relationship

b. An inverse relationship

c. A negative relationship

d. A positive relationship

 

16. If Z is a standard normal random variable, the value of Z, denoted by z, for which Pr(Z > z) = 0.9963 is

 

Select one:

a.2.68

b. -2.68

c. 0.4963

d. 3

 

17. A shopkeeper determines that his revenue during the next year should be approximately normally distributed with a mean of $50,000 and a standard deviation of $10,000. What is the probability that his revenue will exceed $60,000?

Select one:

a. 0.0001

b. 0.9550

c. 0.1587

d. 0.8555

 

18.

 

 

 

19. If Z is a standard normal random variable, then P(Z ≤ -1.75 or Z ≥ 1.75) is

 

Select one:

0.0146

0.0802

0.10

0.0401

 

20. In testing a hypothesis about the population mean, what would be the approximate distribution of t-test statistic in the case of a sufficiently large sample with an unknown population standard deviation?

 

Select one:

a. 0Normal distribution

b. Chi-square distribution

c. F-disribution

d. Student t distribution

 

21. Of the last 100 customers entering Apple store, 20 have purchased  some item. If the classical approach for assigning probabilities is used, the probability that any two of the next three customers will purchase an item is

 

Select one:

a. 67%

b. 9.6%

c. 20%

d. 50%

22.

 

 

23. A regression analysis between the demanded quantity (y) in kg and the price per kg (x) in $ of potatoes has resulted in the equation, ? = 42 - 3x. At what price will the estimated demand be 27 kg?

 

Select one:

a. $5

b. $42

c. $9

d. $39

 

24. In a given hypothesis test, the null hypothesis can be rejected at the 10% level of significance, but cannot be rejected at the 1% and 5% levels. The most accurate statement about the p-value for this test is

 

Select one:

a. p-value > 0.01

b. 0.05 < p-value < 0.1

c. 0.01 < p-value < 0.1

d. 0.01 < p-value < 0.05

 

25.

 

 

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  1. D
  2. 0.384
  3. C
  4. C
  5. B
  6. C
  7. C
  8. C
  9. A
  10. C
  11. D
  12. B
  13. C
  14. D
  15. D
  16. B
  17. C
  18. A
  19. D
  20. A
  21. B
  22. B
  23. A
  24. C
  25. D