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Public Health and Nutrition
A recent study suggests that the number of steps walked per day is strongly associated with good health.8 A person's heart rate indicates how hard the heart is working to circulate blood throughout the body and is a measure of health. A lower resting heart rate may reduce the risk of heart attack and stroke, and also increase endurance. A random sample of adults between 35 and 40 years old was obtained, and each person wore a pedometer for a day. The number of steps taken, x, was recorded, and the next day the resting pulse rate (beats/minute), y, for each person was also measured.
a. Find the estimated regression line and explain the meaning of the estimated coefficient β^ = 1.
b. Complete the ANOVA table (without the p value), and find and interpret the coefficient of determination.
You are testing a null hypothesis that there is no linear relationship between two X and Y. From your sample of n=20, you determine that SSR=60 and SSE=40
If it costs 1 cent to make a liver-flavored biscuit and 2 cents to make a chicken-flavored one, what is the optimal product mix for a package of the biscuits in order to minimize the firm's cost?
The Skateworld Company operates ice rinks in several major cities throughout the United States. During each session of open skating, one customer is selected at random to receive a free pass for a future open skating session.
a researcher measures how positive a persons mood is and how creative he or sheis obtaining the following interval
Can you provide an example using your own data set (two related and unrelated variables) of at least twenty numbers each and apply the formula of correlation. Determine the correlation of each of the two sets of data.
What are examples in which regression analysis is used for forecasting? What are some primary and secondary sources of data that may be used in correlation and regression analysis?
Based on a sample of restaurants in a large city, the frequencies are found to be f1 = 5, f2 = 8, f3 = 20, f4 = 32, and f5 = 23. What is the sample size, n? Verify that the sample mean is X‾ = 3.7.
The scores on an aptitude test required for entry into a certain job position have a mean of 500 and a standard deviation of 120. If a random sample of 36 applicants has a mean of 546, is there evidence that their mean score is different from the ..
Explain how researchers could conduct a double-blind, double-dummy experiment to compare echinacea tea with chewable vitamin C pills for effectiveness in preventing colds.
Assuming that the manager's claim is correct, calculate the probability that 117 or fewer of 205 randomly selected marketing researchers would disapprove of the scenario.
according to the irs the average tax refund for the 70 million personal income tax returns in 1998 was 800. assuming a
Describe the statistics (i.e. media, standard deviations, frequency, etc.) for each variable and items included in the study (197) through excel.
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