Questions from Statistics

Q: Construct a stem plot of these test scores: 67, 72

Construct a stem plot of these test scores: 67, 72, 85, 75, 89, 89, 88, 90, 99, and 100. How does the stem plot show the distribution of these data?

Q: Briefly describe how each of the following can be used to show

Briefly describe how each of the following can be used to show multiple data sets: a multiple bar graph, a multiple line chart, and a stack plot. When is the stack plot most useful?

Q: Our survey found that 56% of voters approve of a particular

Our survey found that 56% of voters approve of a particular policy of the President, with a margin of error (for 95% confidence) of 4 percentage points. Therefore, there is only a 5% chance that the p...

Q: To learn about smart phone ownership, I chose a null hypothesis

To learn about smart phone ownership, I chose a null hypothesis claiming that the proportion of adults who own a smart phone is equal to 0.8, and the result of my hypothesis test proved this claim to...

Q: A researcher conducts a hypothesis test to test the claim that a

A researcher conducts a hypothesis test to test the claim that a new drug is effective in lowering LDL cholesterol. The P-value for the test is 0.001, and the researcher claims that this supports the...

Q: The results of my hypothesis test were statistically significant at the 0

The results of my hypothesis test were statistically significant at the 0.01 level, so no one can doubt my claim any longer.

Q: After conducting a hypothesis test, I found that my result was

After conducting a hypothesis test, I found that my result was statistically significant at the 0.05 level and had a P-value of 0.3.

Q: In a test of the claim that, among patients treated with

In a test of the claim that, among patients treated with Ziac, the proportion who experience dizziness is less than 0.06, the null hypothesis is p < 0.06.

Q: A study is designed to determine the proportion of men who weigh

A study is designed to determine the proportion of men who weigh more than 195 pounds, so the null hypothesis is µ = 195 pounds and the alternative hypothesis is µ > 195 pounds.

Q: When interpreting a P-value of 0.45, a

When interpreting a P-value of 0.45, a researcher states that the results are statistically significant because the P-value is less than 0.5, indicating that the results are not likely to occur by cha...