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The following figures display data that depict the relation between students' monthly cell phone bills and the number of hours they report that they study per week.
a. What does the accompanying scatterplot suggest about the shape of the distribution for hours studied per week? What does it suggest about the shape of the distribution for monthly cell phone bill?
b. What does the accompanying grouped frequency histogram suggest about the shape of the distribution for monthly cell phone bill?
c. Is it a good idea to use a parametric hypothesis test for these data? Explain.
two cards are drawn without replacement from a standard deck of fifty-two cards. find the probability of these
Test whether the mean weight is less than 10 pounds. Use P-value approach.
Find a 95% confidence interval for the mean amount spent by patients at the pharmacy. Show your calculations and/or explain the process used to obtain the interval.
evaluate the practice of altering the alpha level so that a two-tailed test will have a 5 rejection region on both
The probability of success for any trial of a binomial experiment is 25%. Find the probability that the proportion of successes in a sample of 500 is less that 22%. Repeat with a sample of 800. Repeat with a sample of 1,000.
Three children living, has assets of $156,000, has an index of health status of 141, and has 2.5 social activities a week on the average?
Tires. A tire manufacturer believes that the treadlife of its snow tires can be described by a Normal model with a mean of 32,000 miles and standard deviation.
According to genetic theory, the blossom color in the second generation of a certain cross of sweet peas should be red or white in a 3:1 ratio. That is, each plant has probability 3/4 of having red blossoms, and the blossom colors of separate plan..
If no fallacy is committed, write "no fallacy." All men are mortal. Therefore, someday man will disappear from the earth.
It is given that 60% of the employees at a large company are women. A simple random sample of 15 employees is selected from this company.
1.Why do we care whether the assumptions required for statistical tests are met? (Tip: You might also want to write your answer on a note card you paste to your computer.)
Represent (X,Y) as a function of (U,V). Find the joint density f(u,v) for (U,V) (Hint: take into account the region where it is non-zero). Calculate f(1,0) and input it as the answer.
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