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# Sample and Population Descriptive Statistics

1. The Gallup Organization contacts 1,426 undergraduates who attend a college and live outside the U.S. and asks whether or not they had taken a course in a conversational English during their studies.

-What is the population in the study?
-What is the sample in the study?

2. Identify the type of observational study (cross-sectional, retrospective, or prospective) describe below

-A research company uses a device to record the viewing habits of about 10,000 households and the data collected over the next 4 years will be used to determine whether the proportion of households tuned to a particular educational program decreases.

3) The length of each book is 10 words which is listed below. Find the mean and median than compare results.
Terry 9 2 2 3 3 6 4 5 3 3
David 3 5 2 3 1 3 1 3 3 2

4.) Find the range, variance, and standard deviation. Is the lowest duration time unusual? Why or why not?
79 93 236 192 160 261 198 376 258 233 388 335 224 241 0

5) Which is relatively better: a score of 73 on a Psychology test or a score of 56 on a Economics test? Scores on a psychology test have a mean of 91 and a standard deviation of 9. Scores on the economics test have a mean of 63 and a standard deviation of 3?

#### Solution Preview

1.
-What is the population in the study? all undergraduates who attend a college and live outside the U.S.
-What is the sample in the study? 1,426 undergraduates

2.
prospective type because the data will be collected ...

#### Solution Summary

The solution gived detailed steps on solving various questions on the statistical concepts and normally distributed data as well. All formula and calcuations are shown and explained.

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