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A professor measures the time X that students take to complete an examination, and the score Y that the students receive. The following measurements are obtained: X: time, Average time (X) = 30 SDx = 10 Y: scores, Average score (Y) = 70 SDy = 20 r = .5
a. About what percentage of students who scored over 92 in the exam?
b. Find the regression equation
c. Evaluate the r.m.s. error for the regression equation.
The binomial distribution approaches normality as N increases. Explain how this relationship is useful for solving binomial problems involving N > 20. What are the advantages and disadvantages of this approach?
at a local middle school 60 of students are enrolled in choir or band. if a random sample of 5 students is taken what
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?
A 25% loss with probability 0.1 ignoring all other losses what premium should the insurance company charge each season to realize an average profit of $500.
the data below are the final exam scores of 10 randomly selected statistics students and the number of hours they
Is there significant evidence that this production run doesn't meet specifications? Use a 1% level of significance.
The director of admissions at a large university advises parents of incoming students about the cost of textbooks during a typical semester.
find the standard deviations of the random variable. options a 6 b 7 c 10 d
Assume the shopping time followed an approximately normal distribution. Use a 5% level of significance to test the claim that the average shopping time foe women with children in Carson mall is higher than the national average for this type of sto..
a random sample of 5 homes in newberry florida had a mean of 169900 and a standard deviation of 21756. construct a 95
Determine the typical seasonal patterns for sales using the ratio-to-moving-average method. Project the sales for 2004, and then seasonally adjust each quarter.
a study of 24 graduates of four-year colleges revealed the mean amount owed by a student in student loans was 14381.
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