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The average salary of senior managers in the construction industry is $180,000 per year. Suppose we would like to take a sample of senior managers at a newly established company XYZ to see whether the mean annual salary is different from that of the industry.
a) State the null and alternative hypotheses. b) suppose a sample of 40 senior managers at XYZ showed a sample mean annual salary of $170,000. Assume a population standard deviation of $30,000 with a = 0.05 as the value of significance, what is your conclusion? Need to know whether this is a one tailed or two tailed step and how do you know that? Need step by step breakdown so I can follow and study for exam please. The time needed to drive from city A to city B is normally distributed with a mean of 180 minutes and standard deviation of 20 minutes. a) what is the probability that a person will drive from city a to city b in three hours or more? b) what is the probability that a person will drive from city a to city b in more than 140 minutes? c) what is the probability that a person will drive from city a to city b in exactly three hours? d) what is the probability that a person will drive from city a to city b in less than 2.5 hours? Please answer with step by step directions and state formula being used. In an effort to estimate the mean annual amount spent per customer for groceries at a particular supermarket data were collected for a sample of 100 households. The sample showed an average amount of $8,000. If the population standard deviation is $500, a) develop an 80% confidence interval estimate of the population mean annual amount spent b) develop an 85% confidence interval estimate of the population mean annual amount spent c) if the data were collected for a sample of 50 households rather than 100, develop an 85% confidence interval estimate of the population mean annual amount spent, assuming the population has a normal probability distribution. what does is mean a normal probability distribution and how is it different from part a) and b).
A student wanted to construct a 95% confidence interval for the average age of students in her statistics class. She randomly selected 9 students. Their average age was 19.1 years with a standard deviation of 1.5 years. What is the best point esti..
Explain five steps used in hypothesis testing. Be specific, using numerical examples as well as symbols and verbal explanations.
In a recent year, the FCC reported that the mean wait for repairs for AT&T customers was 25.3 hours. In an effort to improve this service, suppose that a new repair service process was developed.
The following data shows the packages gathered for delivery for ten days and the proportion of packages received not delivered to the customers at expected time.
The probability the second truck is available is .51, and the probability that both trucks are available is .41: What is the probability neither truck is available?
From the calculator manufacturer?s point of view, which type of error would be considered more serious and explain why? From the printed circuit supplier?s point of view, which type of error would be considered more serious and explain why?
Suppose you want an 85 percent confidence level. What value would you use to multiply the standard error of the mean?
The probability of drawing a 6 (to complete an inside straight) after discarding the ace.
He asks you to develop a proposal for the study and submit it to him. Develop the management-research question hierarchy that will help you to develop a specific proposal.
A seminar is given to three levels of managers (highlevel, midlevel, lowlevel).The facilitators believe the evaluations may vary with the audience.
Conduct the most appropriate hypothesis test using a 0.05 significance level. Construct a 95% confidence interval for the true proportion of automobiles with drive trains that fail.
Without constructing the 98% confidence interval for the rate of effectiveness, would you expect the interval to be longer or shorter compared to the 95% confidence interval? Why?
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