You just completed a small research project for your psychology class concerning

Question

You just completed a small research project for your psychology class concerning the effects of an event that happened two years ago on women's opinions and actions today. The mean age of participants in your study is 20.1 years with a standard deviation of 2.7 years. As you write up your results, you realize that what matter is the ages of the participants two years ago when the event happened, not their ages now. You decide to subtract 2 from each of your participants' age. After you subtract 2 years, the mean age in your sample is ? years. The new standard deviation of the ages in your sample is ? years. One of the variables you collected was the study participants' height in centimeters. The mean height of participants in your study is 165.4 centimeters with a standard deviation of 8.3 centimeters. Your professor, however, requested that you report this value in inches. To convert from centimeters to inches, you multiply by 0.394. After you multiply the heights of your participants by 0.394, the mean height in your sample is ? inches. The new standard deviation of the heights in your sample is ? inches.

Explanation / Answer

1)After you subtract 2 years, the mean age in your sample is =20.1-2 =18.1

new standard deviation of the ages in your sample is =2.7

2)

mean height in your sample is =165.4*0.394 =65.1676

The new standard deviation of the heights in your sample is =8.3*0.394=3.2702

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