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Dr. Stallter has been teaching basic statistics for many years. She knows that 80 percent of the students will complete the assigned problems. She has also determined that among those who do their assignments, 90 percent will pass the course. Among those students who do not do their homework, 60 percent will pass. Mike Fishbaugh took statistics last semester from Dr. Stallter and received a passing grade. What is the probability that he completed the assignments?
A standard IQ test has mean of 98 and a standard deviation of 16. We want to be 99% certain that we are 8 IQ points of the true mean. Determine the sample size.
This model is fit to the data using the method of least squares using statistical software, and the following parameter estimates and their standard errors are obtained.
Perform an exponential smoothing forecast with α=0.3 with the following data. Use the demand for the month of January for the initial forecast.
Given that Z is a standard normal random variable. What is the value of Z if the area to the left of Z is 0.9382?
For a particular population, a sample of n = 9 scores has a standard error of 4. For the same population, a sample of n = 16 scores would have a standard error of ??
Describe what do you mean by conditional probability. Give clinical example to support the explanation.
Using the results, describe the effect of an outlier or extreme value on the confidence interval.
You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You decide on the 95 percent confidence level and state that the estimated proportion must be within 2 percent of the population proportion.
A part of our research design is the data collection process. We often do this by sampling. Differentiate between random and nonrandom sampling methods.
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:
Estimate using three day weighted moving average. Estimate sales for the next day using a three-day weighted moving average where the weights
Assume that p-value was 0.07, would you reject null hypothesis of equal mean rates for a Type- I error rate of 5%? (Circle one).
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