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The number of cars, X, that pass through a certain intersection on any weekday is approximately normally distributed with a mean of 852 and a standard deviation of 143. The proportion of days when at least 800 cars pass through the intersection is about?
At a = 0.05, can you reject claim that at least 52% of adults are more probable to purchase a product when there are free samples?
In the past an autoobile repair shop owner has noticed that sales increased ats certain economic indicators decreased. Calculate the expected sales increase and the standard deviation.
For a normal population with u. = 80 and a = 20 which of the following samples is least likely to be obtained?
Find the difference between the actual Y value and predicted Y value for each individual, square the differences, and add the squared values to obtain SS residual.
To test the hypothesis that students who finish an exam first get better grades, the Professor kep track of the order in which papers were handed in.
How large a sample is needed to estimate the true proportion of homeowners who have snow blowers to within 5% using a 98% confidence level?
Enter the data into R, and calculate the means for placebo and epinephrine. Find a 95% confi dence interval for the mean difference in cholesterol levels between the placebo and epinephrine. Use the confi dence interval to test your null hypothes..
If a student scored 90 points on a test where the mean score was 82.2 and the standard deviation was 5.7. What steps do I do to find out the student's z score?
A professor asked her sophomore students, "How many drinks do you typically have per session? (A drink is defined as one 12oz beer, one 4oz glass of wine, or one 1oz shot of liquor.)"
Assume if the students toss the coin 200 times each about 68% should have proportions among what two numbers.
A medical researcher found a significant relationship among a person's age x1, cholesterol level x2, sodium level of the blood x3, and systolic blood pressure y.
Assume that the master budget for Cannondale shows total variable expenses of $10,000. The budget was based on production of 5,000 units. Cannondale sells all units it produces.
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