1) Which of the following data sets represents a population?

Select one:

a.Heights of all students in a college

b.Scores of randomly selected group of students

c.Weights of ten girls in a class of 30 students

d.Ages of voters who registered on a particular day

e.Any five day's temperature readings of the last month

2) In order to get promoted to the next grade, a student is required to score above 55 in the final test. Assume the scores to be normally distributed with a mean of 60 and a standard deviation of 5.5. Calculate the percentage of students who will be promoted to the next grade.

Select one:

a.18.14%

b.81.86%

c.67.50%

d.62.50%

e.52.50%

3) A sample is large enough for the distribution of sample proportion p to be approximately normal if the interval [p - 3 , p + 3 ] lies wholly within the interval _____.

Select one:

a.[-1, 1]

b.[-1, 0]

c.[0, 1]

d.[0, 2]

e.[1, 2]

4) Find the sample mean.

Select one:

a.143.26

b.130.32

c.131.29

d.142.87

e.135.16

5) A fair die is rolled. What is the probability that the number rolled is less than three?

Select one:

a.1/2

b.1/3

c.1/4

d.1/5

e.1/6

6) Compute the sample median for the data: {-5, 4, 8, 5, 2, -1, 3, - 6}

Select one:

a.2

b.3

c.1.25

d.6

e.2.5

7) For the data set {1.5, 2.3, 1.7, 3.6, 2.9, 4.2, 3.3} find the second quartile, Q2.

Select one:

a.2.3

2.9

c.2.6

d.1.7

e.3.6

8) A chi-square test for independence can be used to evaluate whether _____ are independent.

Select one:

a.two pairs of random variables or factors

b.two random variables or factors

c.three pairs of random variables or factors

d.three random variables or factors

e.five random variables or factors

9) As a part of his study, a researcher is interested to ascertain the proportion of people in a locality who are above the age of 80. He takes a random sample of 2,400; 120 of them are above the age of 80, hence 120/2,400 0.05 or about 5% are above 80. What is the value of the statistic in this context?

Select one:

a,2,400

b.100

c.80

d.0.05 or 5%

e.2,400/120

10) For a standard normal variable Z, which of the following z values satisfies the expression: P(Z > z) = 0.57

Select one:

a.0.18

b.-0.18

c.0.72

d.-0.72

e.0.82

11) For a standard normal variable Z, which of the following z values satisfies the expression: P(Z > z) = 0.57

a.0.18

b.-0.18

c.0.72

d.-0.72

e.0.82

12) The deterministic part of the simple linear regression equation describes:

Select one:

a.why the actual observed values of y are not exactly on but fluctuate near a line.

b.the magnitude of the noise in the data.

c.the three parameters in the model.

d.the trend in y as x increases.

e.the expected change in y brought about by a unit increase in x.