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A bank that employs many part-time tellers is concerned about the increasing number of errors made by the tellers.
To estimate the proportion of errors made in a day, a random sample of 400 transactions on a particular day was checked. The proportion of the transactions with errors was computed.
If the true proportion of transactions that had errors was 6% that day, what is the probability that the estimated proportion is less than 5%?
Players who earn more than 2 million dollars a year is found to be between .82 and .88. Given this information, the sample size that was used was approximately?
suppose that 65 of all those who enroll at the university of iowa finish in 6 years. what is the probability that 5
Bottling Company Case Study
Environmental health indicators include air quality, water quality, and food quality. Twenty-five years ago, 47% of U.S. food samples contained pesticide residues. In a recent study, 44 of 125 food samples contained pesticide residues.
A corporate executive reports the re- sults of an employee satisfaction survey, stating that 52% of employees say they are either "satisfied" or "extremely satisfied" with their jobs, and then says "the margin of error is plus or minus 4%." Explai..
A report states that 73% of home owners had a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 0.03 with 98% confidence?
Provide an example of a hypothesis test you could perform at work or at home. State what the Null and the Alternative hypotheses would be in your test.
1 a set of 50 data values has a mean of 15 and a variance of 25.nbsp find the standard score of a data value
At.01 level of significance, is proportion of seeds which germinate dependent on seed type?
Assume that causes of heart failure between individuals are independent. What is the probability that three individuals have conditions caused by outside factors?
A southern state has an unemployment rate of 6%. The state conducts monthly surveys in order to track the unemployment rate. In a recent month, a random sample of 700 people showed that 35 were unemployed.
In the context of this scenario, what would be the consequences of making a Type I error?
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