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The mean age of a sample of 60 students from a class was found out to be 25.3 years. The variance in population age was 16 years.
a) Calculate a point estimate for the population mean
b) Find the 95% Confidence interval for the population mean.
c) Find the 99% Confidence interval for the population mean.
Given the linear correlation coefficient r and the sample size n, determine the critical values of r and use your finding to state whether or not the given r represents a significant linear correlation. Use a significance level of 0.05.
Set up a null and alternative hypothesis to test whether this sample is falling below expectations.
The Human Relations Department of Electronics Inc. would like to include a dental plan as part of the benefits package. The question is: How much does a typical employee and his or her family spend per year on dental expenses?
How could the Central Limit Theorem apply in making a business decision? Try to provide an example from your current or future career.
Use Chebyshev's theorem to find what percent of the values will fall between 120 and 150 for a data set with mean of 135 and standard deviation of 7.5.
The management of a chain of fast food restaurants wants to investigate the relationship between the daily sales volume (in dollars) of a company restaurant and the number of competitor restaurants within a 1 mile radius. The following data have b..
Critically discuss the relationship between a sample and the type of population it is taken from? What population factors should be taken into consideration?
Four different assembly processes were under consideration. Sixteen workers were randomly assigned to the four processes, eight per process. The number of correctly assembled units in an eight-hour work shift was recorded:
A single-sample acceptance attributes sampling plan is required to have a producer's risk of 0.06 for an acceptable quality level of 0.5% nonconforming, and a consumer's risk of 0.10 for a rejectable quality level of 5% nonconforming. Use Minitab ..
Times spent studying by students in the week before final exams follow a normal distribution with standard deviation 8 hours. A random sample of four students was taken in order to estimate the mean study time for the population of all students.
A University Counseling Clinic is interested in predicting the levels of depression from the number of social events attended per week by a sample of their clients. The data are below:
Prior to a statewide senate election, three polls are conducted concerning a particular candidate's popularity. In the first poll, 750 of 1500 voters favor the candidate.
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