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Q1) Assume manufacturer of Advil, common headache remedy, just developed new formulation of drug that is claimed to be more effective. To estimate new drug, a sample of 200 present users is asked to try it. After one-month trial, 180 indicated new drug was more effective in relieving a headache. At the same time sample of 300 current Advil users is given present drug but told it is new formulation. From this group, 261 said it was the improvement. At.05 significance level can we conclude that new drug is more efficient?
Q2) Coffee manufacturer is interested in whether mean daily consumption of regular-coffee drinkers is less than that of decaffeinated-coffee drinkers. Suppose population standard deviation for those drinking regular coffee is 1.20 cups per day and 1.36 cups per day for those drinking decaffeinated coffee. Random sample of 50 regular-coffee drinkers illustrated a mean of 4.35 cups per day. Sample of 40 decaffeinated-coffee drinkers illustrated a mean of 5.84 cups per day. Use.01 significance level. Calculate the p-value.
Compute lower and upper quartiles of log10-balances? Determine 95% range of the balances in $s? Express in English what the two boundaries mean.
Compute descriptive statistics for each stock and the S&P 500. Comment on your results. Which stocks are the most volatile? Compute the value of beta for each stock. Which of these stocks would you expect to perform best in an up market? Which..
For value 10,40,20,50 and 40, value of arithmetic mean is? Simplest measure of dispersion is the Standard deviation, variance, Quartile deviation.
An automobile insurance company estimates the following loss probabilities for the next year on a $25,000 sports car:
Assuming the nurses surveyed were a random sample from the population of all nurses in the United States, we can use these data to test the null hypothesis H0 that there is no association between the row and column variables in this two-way table...
Compute average daily rainfall in the week and for weekends. Get the average of weekdays' rainfalls and average of weekend's rainfalls.
A major benefit of two-way ANOVA over several one-way ANOVAs, If an F test for interaction is significant.
What is Peter's median grade point at graduation? What is the shape of the grade point distribution?
Table shows the smoking habits of group college students. If student is selected at random, determine the probability of getting someone who is man or a woman.
Plan the scatter diagram
For the mold described in (g), can you find the probability that it's COST value will exceed $150,000? If yes, obtain this probability. If no, why not?
Assume that demand for the upcoming weekend is normally distributed with a standard deviation of 30.
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