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Test Concerning Proportions
1. Twenty one out of 100 randomly selected women said they use seat belts, while 117 out of 180 men said the same. Test the claim that men are more safety conscious than women based one the use of seat belts at a 0.01 level of significance. Construct a 99% confidence interval to test the claim.
2. Labor statistics indicate that 88 out of 100 cashiers and servers are women. A random sample of cashiers and servers in a large city indicate that 124 of 150 cashiers and 200 of 250 servers are women. Is there a significant difference in the proportion of servers and proportion of cashiers who are women at 0.05 level of significance?
assuming that the true mean of the population is 5 the standard deviation of the population is 0.75.1- calculate the
Given that 30% of US adults are smokers, find the average of the random variable X= # of smokers in a random sample of 50 residents of the USA, also find the variance and standard deviation of X.
a consulting firm has to make a decision concerning bidding on a major project that has a projected profit for the firm
ten randomly selected shut-ins were each asked to list how many hours of television they watched per week. the results
You work for a local construction firm, "DeVry Engineering Group" and your supervisor wants to test your knowledge and skills with Microsoft Excel and has instructed you to develop a spreadsheet to calculate weekly payroll for "15" employees with ..
Lenght Of Pregnancy. A woman wrote to Dear Abby and claimed that she gave birth 309 days after a visit from her hushand , who was in the Navy. Lengths of pegnancies have a mean of 268 days and a standard deviation of 15 days. Find the z score for 308..
several statistical tests have a way to measure effect size. what is this and when might you want to use it in looking
How many automobiles should be used in the test? Assume that preliminary mileage tests indicate the standard deviationis 2.6 miles per gallon.
For each marksman, the total score was recorded for shots fired during a heartbeat and for shots fired between heartbeats. Do the data belowindicate a significant difference? Test at the α = 0.05 level. Include a formal decision statement regardin..
electrical engineers recognize that high neutral current in computer power system is a potential problem. a recent
assume that a simple random sample has been selected from a normally distributed population and test the given claim.
case study are the fish safe to eat?assessing which factors affect mercury levels in fish in maine lakes.mercury is a
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