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Is it possible to increase the response rate for a mail survey by contacting the respondents before they receive the survey? A study designed to address this question compared three groups of subjects. The first received a preliminary letter about the survey, the second received a phone call, and the third received no preliminary contact. A positive response was defined as returning the survey within two weeks. The data: Response Letter Intervention Phone Call None Yes 25 38 52 No 23 23 58 Is there evidence to conclude that there is a difference between the different methods of intervention? Carry out an appropriate hypothesis test, filling in the information below. A. The value of the test statistic: B. The p-value: C. Your decision for the hypothesis test, assuming a significance level α=0.1:
Consider the following data values of variables x and y. The equation of the least-squares regression line for this data is
Construct a 95% Confidence Interval of the population mean of minutes exercised per week.
Provide a descriptive statistic (to 1 decimal) that could be used to estimate the number of women out of 1000 in this population who have tissue abnormalities.
Perform the trend analysis of Pf with incrementally increasing number of the simulation cycles, and calculate the statistical uncertainty in the estimate expressed as the coefficient of variation.
The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed, with a mean of 3 minutes and a standard deviation of 1 minute.
Create a 99 percent confidence interval for mean daily intake of milk. You may suppose daily intake amounts are usually distributed.
these cars would fall into the 22 to 27 mpg range? Compute the proportion of cars that get more than 28 mpg. What proportion of cars would get less than 23 mpg?
Based on this sample information find out what percent of variation in starting salaries is described by GPA, and find out the equation that would forecast salary from GPA. Give a scatter plot.
In a second grade class containing 12 girls and 7 boys, 2 students are selected at random to give out the math papers. What is the probability that both are girls?
The discussion surrounding the ANOVA is very important. This is a widely utilized statistical tool. What is the ANOVA? What is the purpose of the ANOVA? What role does variation have in the discussion? What is the purpose of the F distributio..
400 customers of the company and finds that 30 of them are actually not happy about the service. Set up the null and alternative hypotheses to test for the company's claim.
What would be the most appropriate graphical representation to show the dispersion of new home prices in a particular area? Why?
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