A large international company with over 1.5 million employees wants to estimate how many of their employees have a cholesterol level that is higher than the recommended level. The company collects data from a random sample of employees and creates a 95% confidence interval for the population mean cholesterol level for all company employees. The upper bound of a 95% confidence interval for the population mean cholesterol level was 261.48, and the width of the same 95% confidence interval was 10.44. In this confidence interval, what is the sample mean (x bar) cholesterol level? Provide your answer as a number rounded to two decimal places

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A large international company with over 1.5 million employees wants to estimate how many of their
employees have a cholesterol level that is higher than the recommended level. The company collects
data from a random sample of employees and creates a 95% confidence interval for the population
mean cholesterol level for all company employees.
The upper bound of a 95% confidence interval for the population mean cholesterol level was
261.48, and the width of the same 95% confidence interval was 10.44.
In this confidence interval, what is the sample mean (x bar) cholesterol level? Provide your answer as a
number rounded to two decimal places
Transcribed Image Text:A large international company with over 1.5 million employees wants to estimate how many of their employees have a cholesterol level that is higher than the recommended level. The company collects data from a random sample of employees and creates a 95% confidence interval for the population mean cholesterol level for all company employees. The upper bound of a 95% confidence interval for the population mean cholesterol level was 261.48, and the width of the same 95% confidence interval was 10.44. In this confidence interval, what is the sample mean (x bar) cholesterol level? Provide your answer as a number rounded to two decimal places
Consider the following situation: Doctors recommend having a total cholesterol level below 200
mg/dl. A large local company wants to test if their employees have a mean cholesterol level that is
different from the recommended level. The company collects data from a random sample of 50
employees and finds that the mean cholesterol level of the employees in the sample is 256 mg/dl,
with a sample standard deviation of 54.5.
Which of the following hypothesis tests would be appropriate in this situation?
z-test for population proportion
O paired t-test
O two-samplet-test for population mean differences
O z-test for population mean
t-test for population mean
Transcribed Image Text:Consider the following situation: Doctors recommend having a total cholesterol level below 200 mg/dl. A large local company wants to test if their employees have a mean cholesterol level that is different from the recommended level. The company collects data from a random sample of 50 employees and finds that the mean cholesterol level of the employees in the sample is 256 mg/dl, with a sample standard deviation of 54.5. Which of the following hypothesis tests would be appropriate in this situation? z-test for population proportion O paired t-test O two-samplet-test for population mean differences O z-test for population mean t-test for population mean
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