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Senior management of a consulting services firm is concerned about a growing decline in the firms weekly number of billable hours. The firm expects each professional employee to spend at least 40 hours per week on work. In an effort to understand this problem better, management would like to estimate the standard deviation of the number of hours their employees spend on work-related activities in a typical week. Rather than reviewing the records of all the firms full-time employees, the management randomly selected a sample of size 51 from the available frame. The sample mean and sample standard deviations were 48.5 and 7.5 hours, respectively. Construct a 99% confidence interval for the standard deviation of the number of hours this firms employees spend on work-related activities in a typical week.
1. using statcrunch calculate the chi-square statistic and degrees of freedom for the following set of data for 300
For a given confidence interval, what is the interpretation of a 96% confidence level?
the area under the density curve that lies to the right of 12 is 0.405. what percentage of all possible observations of
question 1according to a recent survey the average urban person consumes 1.5 kg of food per day. is this figure also
A psychologist is examining the influence of an older sibling in the development of social skills. A sample of 24 three year old children is obtained.
according to most estimates 10 of the people in the general population are left-handed and 90 are right-handed. a
Based on this data can the college conclude that the students in the new program performed better than the rest of the class> A one-tailed test is used equalling .05
The SAT scores of students are normally distributed with a mean of 950 and a standard deviation of 200. What percentage of students score between 1100 and 1200?
Warren Road MacBurger that the mean waiting time was 2.75 minutes. At the 0.05 significance level, can we conclude that the mean waiting time is less than three minutes?
problem 1if various samples of size 15 that is each sample consists of 15 items were taken from a large normal
What are the null and alternative hypotheses for this test? Use ANOVA and the 0.05 level of significance in testing the null hypothesis identified in part (a).
bags of a certain brand of tortilla chips claim to have a net weight of 16 ounces. net weights actually vary slightly
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