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A large manufacturing firm tests job applicants. Test scores are normally distributed with a mean of 500 and a standard deviation of 50. Management is considering placing a new hire in an upper-level management position if the person scores in the upper sixth percent of the distribution. What is the lowest score a new hire must earn to qualify for a responsible position?
Using a critical value, test hypothesis at the 1% level of significance.
A paper manufacturer has a production process that operates continuously throughout an entire production shift. The paper is expected to have a mean length of 11 inches, and the standard deviation of the length is 0.02 inches.
Perform a significant test to assess whether there is an association between mortality from cirrhosis of the liver and duration of employment in the group hired after 1945. Report a p-value.
In some places in the US, people are aware of the need for more care for older citizens, like Dr. Hope. In the election in one area, they put forward a referendum that would increase the county sales tax by one cent to pay for increased services f..
the random variable x has a density functionfx 4xe-2x if 0 lt x lt infinity 0 otherwisecompute the variance of
A number of minor automobile accidents occur at various high-risk intersections in Teton County despite traffic lights. The Traffic Department claims that a modification in the type of light will reduce these accidents.
What is the null hypothesis in a chi-squared test of independence? List the assumptions under which the linear regression model is supposed to work.
Discuss possible study designs. Which of the designs would we use to test our research hypothesis?
Find out the least-squares regression line and interpret its slope.
Find the probability that when 200 reservations are accepted, there are more passengers showing up than there are seats available. Is the probability of overbooking small enough so that it does no happen very often.
q1. a pistachio rancher buys a new fertilizer system that is supposed to increase the yield per acre. she uses the
A half-liter bottle of soft drink is supposed to contain a mean of 520 ml. The filling process follows a normal distribution with a known process standard deviation of 4 ml.
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