Question

50 parents completed a survey on minutes spent per week reading with their children. The mean amount of time spent reading per week was 120 minutes and the variance in the sample was 25. What was the standard deviation of this sample?

4

12.5

5

25

When calculating variance, we square the difference between each data point and the mean in a set of numbers. Why do we do this?

Group of answer choices

The deviation scores will sum to zero and cancel each other out if they are not squared first.

We need to even out the numbers to make them easier to handle.

Squaring the difference between a data point and the mean is the way to calculate deviance.

Larger numbers are easier to calculate than smaller numbers.

When calculating variance, we square the difference between each data point and the mean in a set of numbers. Why do we do this?

Group of answer choices

The deviation scores will sum to zero and cancel each other out if they are not squared first.

We need to even out the numbers to make them easier to handle.

Squaring the difference between a data point and the mean is the way to calculate deviance.

Larger numbers are easier to calculate than smaller numbers.

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Question 92 pts

When would you choose a frequency table over a histogram for summarizing data?

Group of answer choices

Data on gender

Data on weight in pounds

Data with a sample size of over 100

Data that are highly skewed

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Question 102 pts

Which of the following is an example of a continuous (equal-interval) variable?

Group of answer choices

Hours spent on exercise

Rank order of clothing sizes (small, medium, large)

Political party registration

Level of college (freshmen, sophomore, junior, senior)

Answer 1

Standard deviation

We know that sample standard deviation is nothing but the square root of sample variance.

Here sample variance is 25.

Thus sample standard deviation is 5.

Thus third option is the correct one.