A researcher is interested in the eating behavior of rats and selects a group of

Question

A researcher is interested in the eating behavior of rats and selects a group of 25 rats to be tested in a research study. The group of 25 rats is a ____. a. sample b. statistic c. population d. parameter A characteristic, usually a numerical value, that describes an entire population of scores is a ____. a. parameter b. statistic c. variable d. constant What is the shape of the distribution for the following set of scores: 25, 26, 24, 26, 25, 3, 7, 6, 15, 10, 25, 24, 26 a. symmetrical b. positively skewed c. negatively skewed d. cumulative What is the mean of the following set of scores? Scores: 1, 6, 10, 11 a. 4 b. 7 c. 3 d. 14 A sample of n = 20 scores has a mean of M = 55. After one score is removed from the sample, the mean for the remaining scores is found to be M = 51. From this information, you can conclude that the removed score was ____. a. greater than 55 b. less than 55 c. equal to 55 d. It is impossible to estimate the magnitude of the score from the information provided.

Explanation / Answer

1) a sample

2) a Parameter

3) c negatively skewed

4) b 7 ( 28/4)=7

5) a greater than 55

The sum of scores (n = 20) is 20 * 55 = 1100.
The sum of scores without that one score is 19 * 51 = 969
Then the score removed from the sample is 1100 - 969 = 131

So 131 > 55, therefore the answer is greater than 55

5)

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