# (Solved) Math399 Week 1 Assignment: Statistical Study Designs

Question

A study was performed with a random sample of 513 bolts produced at one factory. What population would be appropriate for generalizing conclusions from the study, assuming the data collection methods used did not introduce biases?

Question

A scientist is interested in finding out the effect of soil quality on crop quality. Would an experimental or observational study design be more appropriate?

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A researcher wants to evaluate the effect of using Facebook on happiness. Would an experimental or observational study design be more appropriate?

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A researcher is interested in the effects of watching videos just before bed on the quality of sleep. He has decided to test the claim “Watching 1 hour of video just before going to bed reduces the number of minutes of REM sleep by more than 10%. ” Which of the following data collection processes would be appropriate? Select only one answer choice.

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In a study to add a new feature to a software program, the programmer introduced two categories, men and women, in the survey she conducted. Is the study observational or experimental? If it is an experiment, what is the controlled factor?

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A farmer divided his land into 2 groups of sections randomly. There is no difference in the quality of the soil between the 2 groups of land. He used Type A seeds in the first group and Type B seeds in the second group. After 3 months, the heights of the crops are measured across the two groups of land sections. Is the study observational or experimental? If it is an experiment, what is the controlled factor?

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A study was performed with a random sample of 5 people from a certain city. What population would be appropriate for generalizing conclusions from the study, assuming the data collection methods used did not introduce biases?

Question

A candy manufacturer is interested in the distribution of colors in each of its packages of candy sold. What should the researchers do first?

# Solution:

A study was performed with a random sample of 513 bolts produced at one factory. What population would be appropriate for generalizing conclusions from the study, assuming the data collection methods used did not introduce biases?

Answer: The conclusions would apply to all bolts produced by that factory.

A scientist is interested in finding out the effect of soil quality on crop quality. Would an experimental or observational study design be more…Please click the icon below to purchase the full answer at only \$5.