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Question: Does the amount that people exercise correlate with the number of friends they have? The accompanying table contains data collected in some of our statistics classes. The first and third columns show hours exercised per week and the second and fourth columns show the number of close friends reported by each participant.
a. Create a scatterplot of these data. Be sure to label both axes.
b. What does the scatterplot suggest about the relation between these two variables?
c. Would it be appropriate to calculate a Pearson correlation coefficient? Explain your answer.
As part of a health study, a researcher wants to know the average daily intake of vitamin E for the typical adult.
Perform a chi-square test on the following data (a) Regulation is the best way to ensure a safe workplace.
todays local newspaper lists 22 stocks of local interest. of theses stocks eleven increase five decreased and six
Using the .02 level of significance, conduct a five-step hypothesis testing procedure to determine if the new processes significantly reduced the wait time.
1. you have obtained a sub-sample of 1744 individuals from the current population survey cps and are interested in the
Princess Cruises recently offered a 16-day voyage from Beijing to Bangkok during the time period from May to August.
let the number of trials be n = 3, and let the probability of success be p = 0.0228. Use a calculator to compare:
Sample from a normal population having a standard deviation of 0.04, what is the probability that the mean of a random sample of size 25 will be "off" by at most 0.02.
for any normal distribution what z-score separates the highest 80 of the scores from the rest of the distribution?
A particular bulb is turned on once each evening for an average of 10 hr. If it is desired to have a reliability of 90 percent, what is its design life in days?
In problem, suppose you know the amounts of 18 of the 19 checks you wrote and the average of all the checks. Can you figure out the amount of the missing check?
Smaller the p-value in test of hypothesis, the more important the results are.
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