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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.
By using the normal probability distribution, what is the probability the car will be repaired in 35 minutes or less?
Compute mean and standard deviation for sample of N = 8 females and sample of N = 8 for males.
What is the approximate permutation test P-value and What is the permutation test P-value for testing the equality of the means versus the hypothesis that the mean change for the treatment group is larger than the mean treatment for the control gro..
Drug sniffing dogs must be 95% accurate. A new dog is being tested and is right in 46 of 50 trials. Find a 95% confidence interval for the proportion of times the dog will be correct.
Formulate the hypotheses that can be used to test the validity of the brokerage firm executive's claim.
Then use ogive to estimate median and first and third quartiles. Also utilize it to reply following question: What percent of 60 mutual fund loads are less than 75.
The sample size n, the sample means, and the sample standard deviations for the two groups are given
If random sample of thirty six customer transactions points out that sample mean withdrawal amount is $172, is there evidence to think that population mean withdrawal amount is no longer $160? Determine the mean of data above?
For the data shown below, prepare a x-bar chart. Note that the sample size is three. Record the values for the UCL, center line, and LCL. In addition, note any points that are out of control.
Find the probability of failure of system for any 4 hours of operation?
How many commercials' worth of data do I need to have a margin of error no more than 3, the correct set of hypotheses
Suppose among 312 large city residents sampled, 65 refused to cooperate. What is the margin of error at the 95% confidence level.
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