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Towers Perrin, a New York human resources consulting firm, conducted a survey of 1100 employees at medium sized and large companies to determine how dissatisfied employees were with their jobs (The Wall Street Journal, January 29, 2003). A total of 473 employees indicated they strongly disliked their current work experience.
a. What is the point estimate of the proportion of the population of employees who strongly dislike their current work experience?
b. At 95% confidence, what is the margin of error?
c. What is the 95% confidence interval for the proportion of the population of employees who strongly dislike their current work experience?
Test the hypothesis that more than 60 percent of the U.S. senators (of a total 100 senators) favor the president's economic plan, if a sample of 40 showed that 22 favor the plan (use alpha = .05).
In a bumper test, three types of autos were deliberately crashed into a barrier at 5 mph, and the resulting damage (in dollars) was estimated.
A large university says the mean number of classroom hours per week for full-time faculty is more than 9. A random sample of the number of classroom hours for full-time faculty for one week is listed.
At the 0.05 level of significance, test whether the mean baseline body mass index for the population of middle aged men who develop diabetes is equal to 24.0 kg/m 2 , the mean for the population of men who do not. What is the p-value of the test?
write down the hypothesis the test used the p-value and the interpretation then hand calculates a 95% CL for the odds ratio estimate on this last test.
Suppose 1.5 percent of the antennas on new Nokia cell phones are defective. For a random sample of 200 antennas, find the probability that:
Maria Gomez, a research analyst in the state department of health, has undertaken a study of the possible consequences of overbuilding hospital facilities.
At the .05 significance level, is the number of units produced on the afternoon shift larger?
Consider a machine that fills soda bottles. The process has a mean of 15.9 ounces and a standard deviation of 0.06 ounces. The specification limits are set between 15.8 and 16.2 ounces. a) Compute and interpret the machine's Cp
Examine relationship between GNP per capita and the percentage of respondents willing to pay more taxes. Create a table using the data below for the GNP per capita and the percentage willing to pay higher taxes.
Perform the chi-square test for a uniform distribution. At α = . 01, does this sample contradict the assumption that readership is uniformly distributed?
The sample standard deviation was 1.1 years. Using the 0.99 degree of confidence, what is the confidence interval for the population mean?
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