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The gestation time for humans has a mean of 266 days and a standard deviation of 25 days. If 100 women are randomly selected, find the probability that they have a mean pregnancy between 266 days and 268days.
At 95% confidence using the critical value approach, determine if the proportion of females in the company is significantly less than 50%.
If the population standard deviation is σ = 20 is the 6 point effect large enough to be statistically significant? Use the two - tailed test with α = .05
Assume that Leo advertises "If it takes more than 30 minutes to get your pizza, you get it free". What percentage of his take-out pizzas will have to give away free?
Appalachian Coal mining believes it can enhance labor productivity and therefore net revenue by reducing air pollution in its mines. It estimates that the marginal cost function for reducing pollution by installing additional capital equipment is.
The variable recorded for each subject was the number of additional yards (possibly negative) that the subject could drive the ball by the end of the season. In the two-way ANOVA the DFM
Hypothesis test for difference between two population variances - compare the variation in the selling price of homes on the oceanfront with those one to three blocks from the ocean.
Which of the following would be a reason to choose a Moving Average Forecast model instead of a Naïve Model to forecast a series of data into the future?
In a public opinion poll, 48% of 189 respondents favor an elimination of taxes on dividend income.
You are the manager of a softball league in the locality in which there are 5 local teams with 10 people each. The league has been arranged for parity so that each local team has 5 good players and 5 bad players.
Is there evidence of a difference in the median performance between the two methods? (Use x = 0. 05).
A company that has 200 employees chooses a committee of 15 to represent . When the committee is formed, none of the 56 minority employees are selected. if the committee is chosen randomly. What is the probability that it contains no minorities.
Hagger Engineering Corporation is considering undertaking several proposed projects for the next fiscal year. The projects, the number of engineers and the number of support personnel necessary for each project.
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