Lab Assignment 2

My electric bills for June, July, and August last summer were $75, $75, and $150, respectively. What was the mean amount for the three bills?

$100

What is the mode for the following sample of n = 8 scores? Scores: 0, 1, 1, 1, 2, 2, 3, 3

1

For the following data, N = _____.​ X f 4 2 3 4 2 3 1 2

11

What is the mean for the population of scores shown in the frequency distribution table? ​ X f 5 2 4 1 3 3 2 2 1 2

2.9

For the data in the following table, what is the value of ΣX?​ X f 4 1 3 2 2 4 1 2

20

​After 5 points are subtracted from every score, the sample mean is found to be M = 24. What was the mean for the original sample?

29

​For the following distribution of quiz scores, how many individuals had a score of X = 2? X f 5 6 4 5 3 5 2 3 1 2

3

For the scores in the following frequency distribution table, the mean is M = 3. X f 4 1 3 4 2 2

F

A sample of n = 4 scores has a mean of M = 8. If one new score with a value of X = 3 is added to the sample, what will be the value for the new mean?

M=7

A grouped frequency distribution table does not provide enough information to obtain a complete listing of the original set of scores.

T

​A histogram is constructed so that adjacent bars touch.

T

Which types of graphs are used for data from an interval scale?

histogram or polygons

A distribution is positively skewed. Which is the most probable order, from smallest to largest, for the three measures of central tendency?

mean, median, mode

What is the preferred measure of central tendency for scores measured on an ordinal scale?

median

​The students in a psychology class seemed to think that the midterm exam was very easy. If they are correct, what is the most likely shape for the distribution of exam scores?

negatively skewed

If a set of scores is displayed in a frequency distribution bar graph, what scale of measurement was used to measure the scores?

nominal or ordinal

A sample has a mean of M = 86. If one new person is added to the sample, what effect will it have on the sample mean?

not enough info

For the following frequency distribution of exam scores, what is the lowest score on the exam? X f 90-94 3 85-89 4 80-84 5 75-79 2 70-74 1

not enough info