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Question: The Federal Reserve System publishes data on family income based on its Survey of Consumer Finances. When the head of the household has a college degree, the mean before-tax family income is $85,200. Suppose that 60% of the before-tax family incomes when the head of the household has a college degree are between $75,600 and $94,800 and that these incomes are normally distributed. What is the standard deviation of before-tax family incomes when the head of the household has a college degree?
A random sample of 51 observations was selected from a normally distributed population. The sample mean was x = 88.6 , and the sample variance was s2 = 38.2.
a group of 5 statistics students receive the following grades on a test 81 74 62 92 and 76. an intervention plan is
(a) Verify that the mean is 15 and find the standard deviation for the 10 cases for which x is not missing (b) Create a new data set with 20 cases by setting the values for the 10 missing cases to 15. Compute the mean and standard deviation for thi..
Suggest one psychological research question that could be answered by each of the following types of statistical tests:
a) Find the 95% confidence interval for the population mean based on the 37 patients who remain after you drop the outlier. b) Compare your interval in (a) with your interval from Exercise 18.32. What is the most important effect of removing the ou..
Using the results from Problem 2, draw the cumulative frequency in percent. What percent of the observations are below 240 mg/mL using this display?
Design a new type of positive-edge-triggered ?ip-?op called the LH flip-flop. It has a clock C, a data input D,and a load input L. If, at the positive edge of C, L equals 1, then the data on D is stored in the flip-flop.
solve the following standard normal probabilities to five decimalsa. pz gt 0.68b. pz gt -1.56c. pzd. p-1.22e. p2.78 gt
how many different permutations of the word scissors are there? how many permutations have all four ss together? how
The interpretation of natural logarithms and common logarithms
From the approved list of historical films that is here attached, you will choose one film to view and analyze for its historical content, historical themes, and accuracy.
assume that the average full time college student in the u.s. requires a total of 10500 per year to cover the costs of
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