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Do you drink the recommended amount of water each day? Most Americans don't! On average, Americans drink 4.4 eight-oz servings of water a day. A sample of 30 education professionals was randomly selected and their water consumption for a 24-hour period was monitored; the mean amount consumed was 37.8 oz. Assuming the amount of water consumed daily by adults is normally distributed and the standard deviation is 11.2oz, is there sufficient evidence to show that education professionals consume, on average, more water daily than the national average? Use ? = .05.
(a) Find z. (Give your answer correct to two decimal places.)
(ii) Find the p-value. (Give your answer correct to four decimal places.)
At the .01 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales?
The germination success rate for begonia seeds is 60%. In a package of 200 seeds,
Determine the critical region and critical values for z that would be used to test the null hypothesis at the given level of significance.
Assume that the joint probability density function of X and Y is given by? Find the marginal probability density function of X.
Use the sample results with a 0.05 significance level to test the claim that pulse rates of men have a standard deviation greater than 10 beats per minute.
With a Rejection Region of 8, 9 or 10, what is the probability of a Type II error, if the job applicant has a probability of identifying the odd sample with p = 0.5?
What can you conclude from Chebyshev's theorem about the percentage of adults in the town whose heights are between 57.3 and 77.7 inches? Please show work.
There is an operator at the center who places 25 outgoing calls in a one-hour period. What is the probability that this operator will get live answers on 7 or more calls?
Benz-Merc Cars produces four classes of cars: subcompact, compact, intermediate and luxury. BM also produces trucks and vans. Vendor capacities limit total production capacity to at most 1.2 million vehicles per year.
What would be a good example of a null and alternative hypotheses for a decision relevant in life? What Type I and Type II errors could occur with your decision-making process?
In the study of age and systolic blood pressure of five randomly selected subjects, a researcher reported the following data.
Point is uniformly distributed in the unit sphere in three dimensions. a) Determine the marginal densities of the x, y, and z coordinates.
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