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Let x be a random variable that represents the level of glucose in the blood (mg/dl) after a 12-hour fast. Assume that for people under 50 years old, x is distributed approximately N(85, 25). A test result x < 40 is an indication of severe excess insulin, and medication is usually prescribed. What is the probability that on a single test, x < 40?
Using a .05 level of significance, test whether the sample results indicate that the manufacturing process is functioning properly.
Assume that the process is in control and that the population of all jar fills is normally distributed.
The maturity scores tend to be skewed (not normally distributed). Higher scores indicate higher Christian maturity. What statistical test should be used to analyze these data?
Forecast sales for the next day using a three-day weighted moving average where the weights are 3, 1, and 1 (the highest weight is for the most recent number).
Compute the test statistic. Use the t distribution table to compute a range for the p value. What is the rejection rule using the critical value? What is the conclusion?
A woman has a collection of snakes and iguanas. Her young son observed that the reptiles have a total of 50 eyes and 56 feet. How many reptiles of each type does the woman have?
Describe the advantages and disadvantages of quasi-experiments? What is the fundamental weakness of a quasi-experimental design? Why is it a weakness? Does its weakness always matter?
A sample of 50 customers resulted in a sample mean of $90. What is the probability of obtaining a sample with a sample mean smaller than $90?
Quality control engineer has been checking output by almost continuous sampling as abnormal condition began. Determine the probability that in sample of 10 pieces.
One thing you have learned is that the tangency portfolio will give you the maximum Sharpe ratio. Consequently, you have constructed such a portfolio. What are you portfolio weights.
Super Cola Bottles soft drinks labeled "net weight 16 ounces." An overall process average of 16.01 ounces has been found by taking several batches of samples, in which each sample contained 5 bottles.
What is the estimated index of satisfaction for a person who first married at 18, has an annual income of $26,500, has three children living, has assets of $156,000, has an index of health status.
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