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The pH of a solution is measured eight times by one operator using the same instrument. She obtains the following data: 7.15, 7.20, 7.18, 7.19, 7.21, 7.20, 7.16, and 7.18.
(a) find out the sample mean. Suppose that the desirable value for this solution was specified to be 7.20. Do you think that the sample mean value computed here is close enough to the target value to accept the solution as conforming to target? describe your reasoning.
(b) find out the sample variance and sample standard deviation. What do you think are the major sources of variability in this experiment? Why is it desirable to have a small variance of these measurements?
Test at the 1% significance level whether currently all adult men spend less than 11 hours per week watching sports on tv. Calculate the p-value for this problem and conduct the test using the p-value method.
What other information would you like to know to answer the question about salary equity between the genders? Why?
If an auditor takes a random sample of 36 accounts what is the probability that the mean balance will be less than 45?
Why does Bob continue to play the video game even after losing $300?
Could you please tell in what situation the maentl hanszel test is more appropriate than using chi square. I believe maentl hanszel is used when a confounding variable is present thus allowing for adjustment
If 40 voters are chosen at random and X is the number of voters that support this referendum, find the standard deviation of X.
In order to monitor the ecological health of the Florida Everglades, various measurements are recorded at different times. The bottom temperatures are recorded at the Garfield Bight station
Determine the sample size necessary to estimate a population mean to within 1 with a 90% confidence given that the population standard deviation is 10.
The time to failure of a nickel-cadmium battery is Weibull-distributed with parameters v=0 α = 1/2 years and β = 1/4. Find the fraction of batteries that are expected to fail prior to 1.5 years.
Decileter and standard deviation of 41 mg/dl. in an srs of 100 men what is the probability that x bar takes a value between 185 and 191 mg/dl?
Solve the linear programming model by using the computer. Identify the sensitivity ranges for the objective function coefficients and explain what the upper and lower limits are.
Let μ be the mean perceived age estimate for all viewers of the ad, and suppose we consider the industry requirement to be met if μ is at least 25. Set up the null and alternative hypotheses needed to attempt to show that the industry requirement ..
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