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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 sample mean is 50, the t-critical value is 1.96, and the standard error of the sample mean is 2.
Psychologists wanted to test whether a certain accelerated class' IQ was different than average. There were 25 students in the class; their mean IQ score was 108.
Suppose that a quarter is randomly selected, what is the probability that this quarter has high productivity growth and has a large pay increase?
How many students should be surveyed to estimate the mean score within 25 points with 90% confidence?
Determine following probabilities where Z follows standard Normal distribution?
Compute standard normal z-score corresponding to value of x = 23. e. Determine P(x 23). G. Determine P(16
Where does the p-value come from for the spatial scan statistic used in SaTScan? How Monte Carlo simulation is used to derive a p-value for a cluster ?
Probability of two mutually exclusive events intersecting Can be any value between 0 to 1, Must always be equal to 1.
Experience raising New Jersey Red chickens revealed the mean weight of the chickens at five months is 4.35 pounds. The weights follow the normal distribution.
Is there evidence that mean dimension is not 221 mm? Suppose population is normally distributed. Use a=0.05 and critical value method.
A hospital human resources manager finds that the local average starting salary for nurses is $24,000. She randomly samples 10 nurse's salaries at the hospital and calculates a mean of $23,450 and a standard deviation of $400.
Confirm whether given random variable is binomial distribution or not. If this experiment is finished with replacement, explain why.
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