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A personnel manager is estimating the total number of person-days lost to unexcused absences by hourly workers in the last year. In a random sample of 50 employees drawn without replacement from the 687 hourly workers at the company, records show that the 50 sampled workers had an average of x = 4.3 days of unexcused absences over the past year with a standard deviation ofs = 1.26.
a. Find a point estimate of and a 95 percent confidence interval for the total number of unexcused absences by hourly workers in the last year.
b. Can the personnel manager be 95 percent confident that more than 2,500 person-days were lost to unexcused absences last year? Can the manager be 95 percent confident that more than 3,000 person-days were lost to unexcused absences last year? Explain.
The actual amount of icing sugar that a filling machine puts into "180 gram" jars is well modeled as a normally distributed random variable with σ = 1.88 gram. If it is desired that only 1.2% (i.e. 0.012) of these jars are to contain less than 180.00..
Determine the sample size that makes the margin of error in a 95 percent confidence interval for the proportion of the 1,323 vouchers that were filled out incorrectly equal to .04.
1. a researcher studying the effects of environment on mood asks participants to sit alone in a waiting room for 15nbsp
In 2012 the Centers for Disease Control and Prevention reported that in a sample of 4,349 African Americans 31% were Vitamin D deficient. A 90% confidence interval based on this sample is (0.30, 0.32). It is believed that among the general population..
Your readings this week have provided you with an overview of various types of research methodologies falling under Quantitative, Qualitative and Mixed Methodology research
Assignment Objectives: Construct a scatter plot for two variables, compute a correlation coefficient, and a regression equation. Use the regression equation to predict a value of the dependent variable.Purpose: In this week's assignment, we ..
Suppose the joint pdf of lifetimes of a certain part and a spare is given by f(x, y) = e-(x + y); 0
The average farm in the United States
systolic and diastolic blood pressure of femalesthe following table represents systolic and diastolic blood pressure
In a study on speed control, it was found that the main reasons for regulations were to make traffic flow efficient and to minimize the risk of danger. An area that was focused on in the study was the distance required to completely stop a vehicle at..
The random var x has a normal distribution with population mean (u) of 40 and a population variance (q^2) of 36. Find the value of x. Call it x0, such that... A) P (X >= x0) = 0.10 B) P(X =x0) = 0.40
For a particular regression analysis, it is found that SST = 800.0 and SSE = 300.00. Calculate the coefficient of determination.
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