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A company is interested in estimating the mean number of days of sick leave taken by its employees. The firm's statistician randomly selects 100 personnel files and notes the number of sick days taken by each employee. The sample mean is 12.2 days and the sample standard deviation is 10 days. How many personnel files would the director have to select in order to estimate u to within 2 days with a 99% confidence interval?
The life of a calculator manufactured by Intel corporation has a normal distribution with a mean of 50 months and a standard deviation of one year.
Analysis of data sets assignment
The mean return for the random sample of 33 mutual funds is 14.93 percent with a standard deviation of 9.57. Test the null hypothesis: H0: mu = 15% at α = 0.05.
The results of the simple linear regression are provided below.
At the 0.05 level of significance, is there evidence to suggest that the population mean waiting time to check out is less than 10.73 minutes?
Assuming the nurses surveyed were a simple random sample from the population of all nurses in the United States, find the appropriate null hypothesis for these data
Suppose a student received the following grades for the semester: History, B; Statistics, A; Spanish, C; and English, C. History and English are 5 credit hour courses
Find the P value or an interval containing the P value for the sample test statistic.
The 95% prediction interval for a new patient with a 2-day cholesterol level of 220 is
Bags of tea are sampled to ensure proper weight. The overall average for samples is 8 ounces. Each sample contains 10 bags. The average range is 0.1 ounces.
Make a decision regarding the null hypothesis based on the sample information. Interpret the results of the test and state your conclusion.
Data on distribution of cost for building effort, design work and testing effort.
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