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A random sample of 100 teachers in a large metro area revealed a sample mean salary of $502/week with a sample standard deviation of $48/week. With what degree of confidance can we state that the average weekly salary for all teachers in this area is between $487 and /4517.
CASE STUDY: Are the Fish Safe to Eat? Assessing which Factors affect Mercury Levels in Fish in Maine Lakes.
From past data, it is recognized that company's production process results in normally distributed yield strengths. Test company's claim at a = 0.05.
A researcher is using a chi-square test to determine whether there are any preferences among four brands of cola. With alpha = .05 and a sample of n = 30, what is the boundary for the critical region for the hypothesis test.
This table gives three measurements of 10 samples made in a production run. Use statistical process control method to solve problem.
The 1996 GSS asked, "If husband in family wants children, but wife makes decision that she doesn't want any children. If standard error is 0.01429, determine the 96 % confidence interval for population proportion who would say yes.
What if the number of debilitating network viruses detected in a day at the firewalls of an Internet service provider within a certain geographic region is fueling a possible management decision to upgrade the detection system.
Using data on average school grade for first use. Use the t test to conduct a one-tailed test of the null hypothesis, assuming that the average grade is higher for males than for females
Suppose in an attempt to develop marketing materials Tyco marketers are interested in determining whether there is a significant difference in the cost of replacing pipeline seals in different countries.
Suppose a new weight loss program was sponsored by the local health and fitness club in a small town. The program claims to make people lose more than five pounds in a month. Twelve participants were selected and their weights were recorded.
Do the data indicate any significant preferences among the three versions of the photograph? Test at the .05 level of significance.
What is the likelihood that the mean annual precipitation during 25 randomly picked years will be less than 90.8 inches?
As part of a safety check, the Keystone Cops randomly stopped 65 ambulances and checked their tire pressure. The sample mean was 32 lbs/sq. in. with a sample standard deviation of 2 lbs/sq. in. Find the 98% confidence interval for the population m..
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