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A manufacturer of solar energy batteries has recently developed an energy efficient battery. He has hired a researcher to test the battery for its expected hours of sustained operation of such batteries to have a population standard deviation of 20 hours and a population mean of 30 hours. The consultant is given a sample of 225 batteries to test.
A. Calculate the standard error of the mean.
B. calculate the 95% confidence interval.
C. calculate the 99% confidence interval.
Test the given claim using the traditional method of hypothesis testing.
Compute a 90% confidence interval of the mean for a Weschler intellegence test with mean of 100.00 and standard deviation of 15.00 for a sample of 100 people. Use two decimal places.
Would the Kruskal-Wallis be an appropriate statistical procedure to test this Research Question (RQ)? Please explain your answer.
A population consists of 15 items, 10 of which are acceptable. In a sample of 4 items, what is the probability that exactly 3 are acceptable? Assume the samples are drawn without replacement.
Sun Microsystems has approximately 50% of the high-end Unix machines market with its closest competitor being IBM. Suppose that 15 firms were in the market to purchase a high-end Unix machine. Assume that these firms listened to sales pitches by a..
Perform the 5 steps of hypothesis testing procedure. Please present the calculations and results and Graphs. Make all possible observations and interpret the results
In a sample of 1,000 representing a survey from the entire population, 650 people were from Laketown, and the rest of the people were from River City.
It was reported that 20 readers responded and 87% said "no" while 13% said "yes." Recognize 4 major flaws in this survey.
A wholesaler assures retailer replacement times for TVs normally dist. with mean of 8.2 and s.d. of 1.1. The retailer finds that a random sample of 20 sets from the wholesaler have mean replacement time of 7.6 years.
What would be the most appropriate graphical representation to show the dispersion of new home prices in a particular area? Why?
A researcher wants to determine a 95% confidence interval for the mean number of hours that UMKC students spend doing homework per week.
A cell phone company collects data from a random sample of 500 households. The results indicate that 135 of the households would add an extra cellular number, provided it was offered at a reduced monthly cost.
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