Questions from Statistics

Q: Use the data in the previous question to find all the pairwise

Use the data in the previous question to find all the pairwise confidence intervals for the difference in the population means. How do these confidence intervals support your conclusion in the previou...

Q: Choose the appropriate test: one-sample t-test,

Choose the appropriate test: one-sample t-test, two-sample t-test, ANOVA, or chi-square test. a. You want to test whether an association exists between two categorical variables. For example, you want...

Q: Suppose you have five groups of observations, and you do hypothesis

Suppose you have five groups of observations, and you do hypothesis tests (t-tests) to compare all possible pairs of means. a. How many pairwise comparisons can be done with five groups? List all comp...

Q: The distribution of the scores on a certain exam is N(

The distribution of the scores on a certain exam is N(80, 5) which means that the exam scores are Normally distributed with a mean of 80 and a standard deviation of 5. a. Sketch or use technology to c...

Q: Suppose you have four groups of data, and you want to

Suppose you have four groups of data, and you want to do hypothesis tests (t-tests) to compare all possible pairs of means. a. How many pairwise comparisons can be done with four groups called A, B, C...

Q: Random samples of rents for 1-bedroom 1-bath apartments

Random samples of rents for 1-bedroom 1-bath apartments in Seattle, San Francisco, and Santa Monica were selected and shown in the following table. Use three two-sample t-tests, applying the appropria...

Q: The website Gasbuddy.com reports the least expensive gas prices in

The website Gasbuddy.com reports the least expensive gas prices in some cities on a daily basis. The following table shows the least expensive gas prices for three cities on June 1, 2018. a. Assuming...

Q: The following table shows the least expensive gas prices for three cities

The following table shows the least expensive gas prices for three cities on June 1, 2018, as reported by Gasbuddy.com. a. Assuming the overall level of significance is 0.05, what is the Bonferroni-co...

Q: Assume you have three groups to compare through hypothesis tests and confidence

Assume you have three groups to compare through hypothesis tests and confidence intervals, and you want the overall level of significance to be 0.05 for the hypothesis tests (which is the same as a 95...

Q: The following two headlines concern the same topic. Which one has

The following two headlines concern the same topic. Which one has language that suggests a cause-and-effect relationship, and which does not? Headline A: “Dairy Builds Muscle” Headline B: “People Who...