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A health researcher is interested in determining whether or not the speed at which people walk is related to their cholesterol levels. He picks 100 adult volunteers at random, checks their cholesterol levels, and then times each one while they walk a stretch of 100 yards. He is amazed at the results: a simple regression between the walk times and the cholesterol levels has an R2 of 0.98 and the slope of the regression line is 0.7. Would he be justified in concluding that walking slowly may cause high cholesterol or that high cholesterol may affect walking speed? Discuss why or why not.
The MPG (Miles per Gallon) for a mid-size car is normally distributed with a mean of 32 and a standard deviation of .8. What is the probability that the MPG for a selected mid-size car would be less than 33.2.
Borst et.al. investigated the relation of ego development, age, gender, and diagnosis to suicidality among adolescent psychiatric inpatients.
A manufacturer produces and sells chilled, ready-to-eat pasta salad in round lots of 50 serving units each. These items have a very limited shelf life; therefore, if items are made but not sold, they have no value.
Use the population mean and standard deviation to find the z-score corresponding to 14.5%, the rate offered by the Bar Harbor Bank and Trust Company. Is this above or below the average?
a fan is to produce an air curtain to separate a loading dock from a security room. the air curtain is a jet of air 8ft
What is the difference between calculating a confidence interval on the mean vs calculating the confidence interval on a proportion?
Compute the approximate jp-value associated with the test statistic. Does the sample data support the null hypothesis at the a- 0.05 level?
A high school counselor is interested in the percentage of students who will be going to college. She randomly picks 60 students and finds that 53 will be going to college. Use a 95% confidence level to find the population proportion.
a corporation creates a sinking fund in order to have 980000 to replace some machinery in 9 years. how much should be
set 1 48.2 58.3 62.1 53.8 72.4 56.8 54.1 66.4set 2 44.5 52.1 54.2 46.4 52.7 74.2 51.3 52.4a. with 90
a missile guidance system has five fail-safe components. the probability of each failing is 0.05. find these
question a recent national survey asked adults if they thought the government should continue to fund nasas efforts
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