QUESTION 5

On a 10-point test, the grades obtained by 8 students are:

7, 8, 3, 9, 10, 6, 8, 5

What is the mean for this data set?

7.0

6.9

7.5

8.0

QUESTION 6

In a statistics class the grades obtained were: 93, 72, 80, 95, 90, 70, 91, 85, 86, 100. What is the median of these grades?

90

88

95

80

QUESTION 7

There are 10 colored balls in a box (5 red, 3 blue, 2 green). What is the probability of selecting a red ball and then a blue ball if we do not replace the red ball?

1/6

1/2

3/20

4/5

QUESTION 8

In hypothesis tests, the hypothesis that is assumed to be true is

the null hypothesis

the alternative hypothesis

The absolute hypothesis

The positive hypothesis

QUESTION 9

What is the meaning of a 95% confidence interval for the mean?

That 95% of my sample is OK for further testing.

That I have 95% confidence that the confidence interval contains the parameter that is being estimated.

That 5% of my sample is not OK.

That I am 95% certain that the population mean is 95.

QUESTION 10

If the p-value = .322 and the significance level is .05, then

The null hypothesis is rejected

The null hypothesis is not rejected

The alternative hypothesis becomes the null hypothesis

I can't make a decision until I know the sample size