Question 15 0 / 1 point The major difference between a z ratio and a t ratio is

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Question 15

0 / 1 point

The major difference between a z ratio and a t ratio is that the t ratio

Question options:

really isn't a ratio.

is entirely different.

contains extra variability in its denominator.

contains an extra component.

Question 16

0 / 1 point

Before the null hypothesis can be rejected at a given level of significance, observed values of the t ratio (compared to those for the zratio)

Question options:

must deviate further from zero.

needn't deviate as far from zero.

must deviate the same distance from zero.

must deviate from zero.

Question 17

0 / 1 point

On the basis of a random sample of 25 students from a large university, an educator estimates, with 95 percent confidence, that between 17 to 20 hours describes the mean weekly study time of all students at the university. Accordingly, we can be reasonably certain that

Question options:

95 percent of all students study between 17 and 20 hours.

on average, all students study between 17 and 20 hours.

the sample mean (for the 25 students) was between 17 and 20 hours.

all of the above

Question 18

0 / 1 point

Even when the normality assumption is violated, the t test retains much of its accuracy as long as the

Question options:

population standard deviation is known.

sample size isn't too small.

observed value of t isn't too large.

sample standard deviation isn't too small.

Question 15

0 / 1 point

Explanation / Answer

15 answer is C contains extra variability in its denominator.

16 A must deviate further from zero.

17 D. All of the above

18. B sample size isn't too small

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