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Suppose a new treatment for a certain disease is given to a sample of n=200 patients. The treatment was successful for 166 of the patients. Assume these patients are representative of the population of individuals who have this disease. (a) Calculate the sample proportion of patients who were successfully treated. (b) Calculate the 95% confidence interval for the population proportion of patients who are successfully treated. (c) Write a sentence that correctly interprets this interval.
How is regression analysis used in forecasting? Provide examples. How may it be used to formulate strategies?
An assembly line turns out 10% deffectives. Determine an acceptance number and sampling plan for samples of size 14 and a producers risk of 3%. (AQL = 10)).
Now we would like to evaluate regression equation for X using Y as independent variable.
Assume that the population of hours worked per week by college graduates employed full-time is normally distributed with mean . Can we conclude that is greater than 40 hours? Use the .01 level of significance.
If she has chosen the first weeks rides, how many ways can she choose four more different rides for the second week? Assume that order does not matter.
An oil co. is drilling some wells. the results are described as either a dry well or a producer well. Past experience suggests that 10% of exploratory wells are producer wells.
Compute a 90% confidence interval for the population mean, based on the sample 25, 27, 23, 24, 25, 24, and 59. Change the number from 59 to 24 and recalculate the confidence interval.
By constructing null and alternative hypotheses, computing critical values, and comparing test statistic to critical value.
The sample mean and the standard deviation were determined to be 120 and 40 respectively. The standard error of the mean is?
An LU professor is interested in whether there is a difference between undergraduate students and graduate students in the amount of time spent praying each day.
Should Katie conduct a between-subject ANOVA or a within-subject ANOVA? Describe your answer.
The researchers claimed that of those who completed the program, 85% improved. What possible confounds can you identify in this study?
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