Question

Problem 1 In the following situation describe the how many populations, samples, and which parameter are they testing.

1-A researcher develops a new theory that predicts that the rate of vegetarians will have more of a particular vitamin in their blood than non-vegetarians.

2-A researcher hypothesizes that the average in cholesterol is lower associated with weight loss is really due to exercise. To test this, the researcher carefully controls for exercise while comparing the cholesterol levels of a group of subjects who lose weight by dieting with a control group that does not diet.

3-Suppose a study was conducted on the effectiveness of a class on "How to take tests." The SAT scores average of an experimental group and a control group were compared. (There were 100 subjects in each group.) The mean score of the experimental group was 503 and the mean score of the control group was 499.

5-The scores of a random sample of 8 students on a physics test are as follows: 60, 62, 67, 69, 70, 72, 75, and 78.

Test to see if the sample mean is significantly different from 65.

6-An experiment compared the ability of three groups of subjects to remember briefly-presented chess positions. determine which groups are significantly different from each other

Answer 1

1)
two population
parameter - proportion of a particular vitamin in blood of vegetarians and thatof non-vegetarians

2)
two population
parameter - mean cholesterol level

3)
two population
parameter - mean score

5)
one population

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We have to solve first four sub-parts of a question
parameter - mean of score on physics test