PSY 205: Research Methods I

Module 5: Assignment

Work the following problems.

1. For each of the following data sets find the following.

(You can use the Data Analysis Toolpak (Descriptive Statistics) for most of the calculations, but you’ll need VAR and STDEV functions to calculate the unbiased estimates.)

Mean

Median

Mode

Range

Variance (for describing the data)

Standard deviation (for describing the data)

The unbiased estimate of the variance

The unbiased estimate of the standard deviation

Data Set AData Set BData Set C

Scores on a Math TestScores on English TestScores on a Test of

Spatial Ability

7888100

5590124

736784

887788

9071104

9280108

736878

807784

677784

7692110

2. Describe the normal curve.

3.Compute the z scores for the following raw scores where X = 74 and the standard deviation = 8.

A.66

B.86

4.Using a distribution with a mean of 100 and a standard deviation of 15.

A.What is the percentile score of a score of 112?

B.What is the percentile score of a score of 82?

PSY 205: Research Methods I

Module 5: Assignment

Work the following problems.

1. For each of the following data sets find the following.

(You can use the Data Analysis Toolpak (Descriptive Statistics) for most of the

calculations, but you’ll need VAR and STDEV functions to calculate the unbiased

estimates.)

Mean

Median

Mode

Range

Variance (for describing the data)

Standard deviation (for describing the data)

The unbiased estimate of the variance

The unbiased estimate of the standard deviation

Data Set A

Scores on a Math Test

Data Set B

Scores on English Test

Data Set C

Scores on a Test of

Spatial Ability

78

55

73

88

90

92

73

80

67

76

88

90

67

77

71

80

68

77

77

92

100

124

84

88

104

108

78

84

84

110

1

2. Describe the normal curve.

3. Compute the z scores for the following raw scores where X = 74 and the standard

deviation = 8.

A. 66

B. 86

4. Using a distribution with a mean of 100 and a standard deviation of 15.

A. What is the percentile score of a score of 112?

B. What is the percentile score of a score of 82?

2

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