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Wall Street securities firms paid out record year-end bonuses of $145,500 per employee for 2005 (Fortune, February 6, 2006). Suppose we would like to take a sample of employees at the Jones & Ryan securities firm to see whether the mean year-end bonus is different from the reported mean of $145,500 for the population. Suppose a sample of 30 Jones & Ryan employees showed a sample mean year-end bonus of $139,400. Assume a population standard deviation of $29,000.
a) In proper notation, state the hypotheses of this test.
b) Show your calculation of the test statistic. ______ = ______________
c) Give the p-value of the test to 4 decimals. p = ________________________
d) What is the conclusion about the issue in question
As a part of the feasibility study, they wish to estimate the mean weekly child-care cost of their employees. A sample of 10 employees who use child care reveals the following amounts spent last week.
Most businesses use some form of linear regression in forecasting future conditions. Give an example of the use of regression analysis at your organization. What were the independent and dependent variables?
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The number of false alarms a building fire alarm system registers has a Poisson distribution with a mean of 6 false alarms per year. The variance of the number of false alarms is what?
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A survey showed that 24% of college students read newspapers on a regular basis and that 81% of college students regularly watch the news on TV. The survey also showed that 21% of college students both follow TV news regularly and read newspapers ..
Event A occurs with probability 0.2. Event B occurs with probability 0.3. Event C occurs with probability 0.4. If A, B, and C are disjoint, then
Decide between two stock investment choices. Determine the probability for each condition to make the investment even between the two.
Using part(a), explain to investor differences between distribution of performance figures for the 2 kinds of stock funds.
Using the sample obtained, draw a histogram and calculate mean and variance for 1000 sampled values for random variable Y = X2.
What is the appropriate set of hypotheses to test such that a possible outcome of the test would indicate;
r. Patton is a professor of English. Recently she counted the number of misspelled words in a group of student essays. She noted the distribution of misspelled words per essay followed the normal distribution with a standard deviation of 2.44 word..
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