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Suppose a medical researcher finds a negative correlation between amount of weekly walking and the incidence of heart disease for people over 50 years old; in other words, people who walked more had a lower incidence of heart disease.
One possible explanation for this observed association is that increased walking reduces the risk of heart disease. What are some other possible explanations?
She informs you that your z score was 1.10. What was your percentile score on this test? (enter a number only, rounded to the nearest 2 decimal places.
let x-bar1 117 x-bar2 90 s1 10.8 s2 11.4 n1 50 n2 50. find a 95 confidence interval for the difference in the
the mean height of 8 year old girls in my daughters school is 125 cm with a standard deviation of 0.3 and the height
Suppose that a random sample of 100 accounting transactions using the old method reveals 18 in error, and a random sample of 100 accounts using the new method reveals 6 errors. Is there evidence of difference in method effectiveness? Explain.
suppose that the service life in years of a hearing aid battery is a random variable having a weibull distribution with
a newspaper selected a simple random sample of 1600 readers. they asked whether the paper should increase its coverage
The university police department must write, on average, five tickets per day to keep department revenues at budgeted levels. Suppose the number of tickets written per day follows Poisson distribution with a mean of 9 tickets per day.
You have the lab analyze the number of calories in each of the hot dog samples with the results below. What conclusions can you draw concerning the calorie content of the two types of hot dogs?
An experiment consists of flipping the fair coin three times and noting the number of heads and tails. A random variable x is defined to be two times the number of heads plus the number of tails.
Assuming normal populations with equal standard deviations, use the 0.10 level of significance in comparing the two designs. Construct and interpret the 90% confidence interval for the difference between the population means.
Refer to the previous exercise. PROC LOGISTIC in SAS reports AIC values of 642.1 for the model with the four main effects and the six interaction terms, 637.5 for the model with only the four binary main effect terms, 644.0 for the model with only..
Stock A has an expected return of 12% and a standard deviation of 40%. Stock B has an expected return of 18% and a standard deviation of 60%. The correlation coefficient between Stocks A and B is 0.2.
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