A researcher wanted to determent mine if there was a significant difference in fat content between cookie dough and vanilla ice cream. So the researcher went to Safeway and recorded the fat in one serving (8 ounces) for all the brands of vanilla and cookie dough ice-cream. The results of their “research” is summarized in the following table. Cookie Dough (g) Vanilla (g) 13.5 12.9 14 12.5 13.6 11.5 12.9 10 13 10 9 11 (a) What are the population(s) the researcher is interested in studying? (b) Is this an observational study or an experiment? (c) Was the researchers sampling method biased, if so, what kind of bias? (d) Is the data qualitative, quantitative continuous, or quantitative discrete? (e) Write down the Null and Alternative hypothesis based on the researcher’s initial question. (f) Find the sample mean and sample standard deviation of the fat content for the cookie dough and vanilla ice cream. (g) What statistical test should be performed to test the hypothesis? (h) Perform the test and report the test statistic’s value and any other relevant information. (i) With a 95% confidence level, are the results statistically significant? (j) Write a conclusion based on the original hypothesis. (ie. should we reject or accept Ho… ) (k) Brainstorm ways in which this experiment/study could be improved.
A researcher wanted to determent mine if there was a significant difference in fat content between
cookie dough and vanilla ice cream. So the researcher went to Safeway and recorded the fat in one
serving (8 ounces) for all the brands of vanilla and cookie dough ice-cream. The results of their
“research” is summarized in the following table.
Cookie
Dough (g)
Vanilla (g)
13.5 12.9
14 12.5
13.6 11.5
12.9 10
13 10
9
11
(a) What are the population(s) the researcher is interested in studying?
(b) Is this an observational study or an experiment?
(c) Was the researchers sampling method biased, if so, what kind of bias?
(d) Is the data qualitative, quantitative continuous, or quantitative discrete?
(e) Write down the Null and Alternative hypothesis based on the researcher’s initial question.
(f) Find the sample mean and sample standard deviation of the fat content for the cookie dough
and vanilla ice cream.
(g) What statistical test should be performed to test the hypothesis?
(h) Perform the test and report the test statistic’s value and any other relevant information.
(i) With a 95% confidence level, are the results statistically significant?
(j) Write a conclusion based on the original hypothesis. (ie. should we reject or accept Ho… )
(k) Brainstorm ways in which this experiment/study could be improved.
Trending now
This is a popular solution!
Step by step
Solved in 5 steps with 9 images
