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asked 2021-07-02

Do piano lessons improve the spatial-temporal reasoning of preschool children? A study designed to investigate this question measured the spatial-temporal reasoning of a random sample of 34 preschool children before and after 6 months of piano lessons. The differences (After - Before) in the reasoning scores have mean 3.618 and standard deviation 3.055.

asked 2021-06-24

State whether the investigation in question is an observational study or a designed experiment. Justify your answer in each case. The National Association of Colleges and Employers (NACE) compiles information on salary offers to new college graduates and publishes the results in Salary Survey.

asked 2021-06-01

Determine whether the study depicts an observational study or a designed experiment. Identify the response variable in each case. A sport s report er asks 100 baseball fans if Barry Bonds's 756th homerun ball should be marked with an asterisk when sent to the Baseball Hall of Fame.

asked 2021-06-18

Who is more likely to binge drink—male or female college students? The Harvard School of Public Health surveys random samples of male and female undergraduates at four-year colleges and universities about whether they have engaged in binge drinking. What type of study design is being used to produce data?

asked 2021-10-24

A researcher is interested in determining if there is a significant difference in number of hours of studying in a week between male and female undergraduate students. 15 randomly selected males and 15 randomly selected females from across all majors were used in the study. The mean for females was determined to be 10 hours with a standard deviation of 2.5 hours and the mean for males was determined to be 7.25 with a standard deviation of 2.25 hours. Using an alpha of .05 is there enough evidence that females study on average more than males??

a. Write the hypotheses for this scenario.

b. Is this one tailed or two tailed? Why?

c. What statistical test would be used for this scenario? Explain why.

a. Write the hypotheses for this scenario.

b. Is this one tailed or two tailed? Why?

c. What statistical test would be used for this scenario? Explain why.

asked 2021-03-02

Determine whether the study depicts an observational study or an experimental study.

A study was done to see if sugar consumption can cause hypoeractivity in children. The researcher took four groups of children and assigned different amounts of sugar the children had to consume. After a certain period of time, they assessed whether or not the children were hyperactive.

A study was done to see if sugar consumption can cause hypoeractivity in children. The researcher took four groups of children and assigned different amounts of sugar the children had to consume. After a certain period of time, they assessed whether or not the children were hyperactive.

asked 2021-10-25

In a study designed to prepare new gasoline-resistant coatings, a polymer chemist dissolves 6.053 g of polyvinyl alcohol) in enough water to make 100.0 mL of solution. At \(\displaystyle{25}^{{\circ}}{C}\), the osmotic pressure of this solution is 0.272 atm. What is the molar mass of the polymer sample?