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A company that sells annuities must base the annual payout on the probability distribution of the length of life of the participants in the plan. Suppose the probability distribution of the lifetimes of the participants is approximately a normal distribution with a mean of 68 years and a standard deviation of 3.5 years. Find the age at which payments have ceased for approximately 86% of the plan participants.
A certain pond to check if they are significantly larger than the mean stated above. Is the mean of the sample larger population of this fish? use either L=1% or L=5%.
56% are enrolled in school. If a sample of 500 such children is randomly selected, find the probability that at least 250 will be enrolled in school.
Estimate the true proportion of college students who believe in the possibilty of haunted places with 99% confidence.
Describe the sample distribution of p-hat, the sample proportion of college students with cell phones who send or receive text messages with their phones.
Evaluate the strength of the relationship by computing the coefficient of determination.
State the appropriate null and alternative hypothesis for the following case: The examinations in a large freshmen chemistry class are scaled after grading.
A senior accounting major at Midsouth State University has job offers from four CPA firms. To explore the offers further, she asked a sample of recent trainees how many months each worked for the firm before receiving a raise in salary.
Please state the null and alternative hypothesis in symbols and in words. Compare the P-value to the Level of Significance. Do you accept or reject Ho.
There are 20 qualified applicants for 5 trainee positions in a fast-food management program. How many different groups of trainees can be selected?
A jar contains 2 black marbles and 8 white marbles. If you randomly pick 2 marbles without replacement, what is the probability that you get one marble of each color?
A researcher demonstrated a correlation of r = 0.60 between teacher attire and student academic performance across 150 grade schools in her state.
Chi-square test for goodness of fit - difference in the use of the four entrances?
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