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Calculate the standard error of the sample statistic: A randomly selected sample of 100 students had an average grade point average (GPA) of 3.2 with a standard deviation of 0.2.
Construct a 95% confidence interval estimate for the population mean price for two movie tickets, with online service charges, large popcorn, and two medium soft drinks, assuming a normal distributi
How many samples are required if we wish a 95% confidence interval that is within 0.03 of the true population proportion?
We want a 90% confidence interval that is 8 years wide. If the population variance is estimated to be 85 from previous research, how large a sample should be taken?
Using α = 0.05, state the decision rule and sketch it. (c) Find the sample proportions and z statistic. (d) Make a decision. (e) Find the p value and interpret it. (f) Is the normality assumpt
State the hypotheses for a right-tailed test. (b) Obtain a test statistic and p value assuming equal variances. Interpret these results.
Randomly chosen test sheets from a day's production run show that the mean brightness exceeds the specification? (b) Does the sample show that σ2 < 0.0025?
Include a sketch of your decision rule and show all calculations. (b) Is your decision sensitive to the choice of α? (c) Find the p value.
(a) At the 0.01 level of significance, is the true mean greater than 10? (b) Use Excel to find the right-tail p value. (LO 3, 4 & 5)
Suppose 70% of kids who visit the doctor have a fever, and 15% of kids with a fever have a sore throat. What is the probability that a kid who goes to the doctor has a fever and a sore throat?
Using a level of significance of 0.01, state and test the hypothesis that the mean piston ring diameter is 74.035 mm. Draw conclusions.
Marty's Burger Barn provides a "Be A Glutton" option for all of their combo meals. What sample size will you use? You may assume that this sample size is used for the remainder of the problem.
The National Safety Council (NSC) estimates that off-the-job accidents cost U.S. businesses. What is the probability of no off-the-job accidents during a one-year period (to 4 decimals)?
Three dozen fish fry will be netted and their lengths measured. What is the probability that the sample mean length of the 36 netted trout fry will be less than 3.2 inches?
Using these sample statistics, find a 99% confidence interval for the proportion p of all high school students that read books during the summer break.
Radon levels in a house vary from week to week. In one house a sample of 8 weeks had the following readings for radon level. Find the sample standard deviation, coefficient variation, and range.
Obtain an explicit expression for the reliability function R(t).Will a burn-in work in this case? Why? If so, what is a reasonable burn-in period?
What is the minimum number of components that have to be placed in parallel to meet a reliability requirement of 0.95 at 50 months?
Suppose this reliability cannot be met, and the actual median is 20,000. So the company instead implements a preventive maintenance policy with a maintenance cycle of 4,000 hours. What is the new re
The reliability over its intended life of 2 years is 0.19, which is unacceptable. The company implements a burn-in period of 6 months for new systems. What is the improvement in reliability?
Suppose 15 customers are selected at random. What is the probability that between two and six people inclusive want hot peppers?
When the system fails it takes an average of 7.3 hours to fix. Calculate the reliability over a 37 hour period and what is the steady state availability of the system.
Delivery times follow a normal distribution with a mean of 20 minutes and a standard deviation of 4 minutes. find the delivery time that 20% of all deliveries are less than?
The forum's organizer is to select the order in which the candidates will give their speeches, and must do so in such a way that each possible order is equally likely to be selected. List the outcom
A public relations intern realizes that she forgot to assemble the consumer panel her boss asked her to do.What is the probability she needs to ask 8 people before she fi nds 5 to fill her panel?