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You are asked by owner of Starshine Motel to create the customer satisfaction survey to find out the percentage of customers who are dissatisfied with service. In past year, 20,000 customers were serviced. She wants 95% level of confidence with the allowable statistical error of +/- 0.02. From past estimates, manager thinks that about 4% of customers have expressed dissatisfaction. What sample size must you use for this survey?
The average price of a car wash is $5.00. A sample of six car washes averaged $5.70 and had a sample standard deviation of $1.30. Assuming a normal population, use the critical value method to test the claim at a= 0.05.
Discuss the link between the estimate and the parameter in the context of an hypothesis test. Be sure to reference the appropriate steps of the five step process in your response, based on the steps below:
A share tipping service claims that its selections give an average return of 10% if held for 12 months. An investor wants to investigate this claim and records the returns of the last 20 shares that have met the 12 month period.
Use three decimal places in your answers for this problem. The following table was collected.
Salary information for a random sample of male and female employees of a large company is shown below.
What is the mean of this uniform distribution? What is the standard deviation?
Compute the Kappa statistic and its standard error regarding reproducibility of the diagnosis of dyspnea in the clinic.
Briefly describe correlational research. Name a variable from the workplace that might prove to provide a correlational relationship and explain why you would choose these two?
Construction of confidence interval for difference between first and second sample mean revealed interval to be 10 plus or minus 12. We conclude.
Assume you are given data from a survey showing the IQ of each person interviewed and the IQ of his or her mother. That is all the information you have.
The lifetime of African Cichlids is unknown but the sample of 75 cichlids were taken and its mean life time was 5.2 years with a margin error of 420 days for 95% confidence a) What is the 95% confidence interval for the lifetime of the African fish..
Determine relative frequency of X=4? Generate the cumulative frequencies.
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