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Rob earns $50,000 per year. The mean salary for engineers with less than 5 years experience is $60,000 with a standard deviation of $5000. What is the Z value of Rob? Use Z = [x -population mean]/population standard deviation.
There are three versions of a board game released - version 1, version 2, and version 3. The versions are distributed equally and evenly among all potential sellers of board games.
A Tire company has developed a new type of tire. Extensive testing shows that the number of miles the new tire will run before wearing out is normally distrubuted with a mean of 40,000 miles and a standard deviation of 4,000 miles
The same chance of being selected as does any other group. What is the probability that at least one of the shifts will be unrepresented in the sample of workers?
Identify the null hypothesis, alternative hypothesis, test statistic, P-value or critical conclusion about the null hypothesis and final conclusion that addresses the original claim.
How large sample size must be taken to be 95% confident.
The data below show the average daily high temperature for Chicago, Illinois, for twelve recent spring and summer months. Create a stem-and -leaf diagram for the data.
The required margin of error around the population p. Margin of error: 0.09; confidence level: 95%; from a prior study, p is estimated by the decimal equivalent of 87%.
Natural Science, 415; Social Science, 511; Business Administration, 619; Philosophy, 196. Create a Pareto chart representing this information.
It is often stated in three-shift manufacturing organizations that the quality of work on the second shift is worse than on the first, and that the quality of work on the third shift is worst of all. How would you go about testing that premise?
Suppose that 10% of all adults jog. An opinion poll asks an SRS of 400 adults if they jog. a) What is the sampling distribution of the proportion p^ in the sample who jog?
Assume 41% of all American adults have some college education. American adult is randomly selected. Determine the probability that adult owns stock or has some college education?
Use Hypothesis testing to determine if the data indicate that there are significant differences among the three therapies? Test at the .05 level of significance.
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