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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?
A statistical study reported that a drug was effective with a p-value of .042. Explain in words what this tells you.
Do these data support the claim made by some female managers within the organizations? Report and interpret the p-value.
Experience has shown that radon gas level is approximately normally distributed for this population.
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Waiting time at a bank drive-in widow the average waiting time at a drive-in window of local bank is 10.3 minutes,
Compute the number of French fries that would have to be sampled and measured to be 98% sure of being within 0.4 cm of the true mean.
Suppose you are given a grant to run a controlled experiment. Explain how you would structure the experiment in order to estimate the casual effect of hours on sat.
An investment project is expected to earn $100,000 on average with a standard deviation of $50,000. Assume earnings from this investment project is a normal distribution. Of the next 15 people that invest in this project, what is the probability t..
Is there evidence to suggest a difference in the mean waiting times at the four body shops?
The Kirschner Company has a contract to produce garden hoses for a customer. Kirschner has 5 different machines that can produce this kind of hose. Write the constraint that indicates they have to use at least three of the five machines in their p..
Find a 90% confidence interval for the population average µ of the percentage of hospitals providing at least some charity care.
Find the confidence interval of the true proportion of students to receive a 3.0 GPA. Find the Z score, standard error, range, and your conclusion in a sentence.
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