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The effectiveness of the new drug for treatment of headaches is investigated in clinical trial. New drug is administered at two dosages: 5 milligrams and 10 milligrams. These are denoted as N05 and N10. Superficial properties of medications are identical. Female and male patients are arbitarily assigned to get one of the two new dosages. After one month patients complete quality-of-life (QOL) questionnaire. QOL scores are on a 100 point scale. Standardized mean score is 50. Higher scores point to a better quality of life. Results for QOL of clinical trial are in table below.
Treatment N05 + male: 50 46 69 72 70 47 63 68Treatment N05 + female: 49 42 25 70 46 56 62 42Treatment N10 + male: 61 52 65 54 58 55 61 58Treatment N10 + female: 62 62 59 75 64 76 73 59
a. Test claim that mean responses are same for all populations of patients receiving either treatment and of either gender.b. If mean responses are not all equal, test claim that there is no interaction between kinds of treatment and sex.c. If there is significant interaction find out which treatment-sex combination has highest mean quality-of-life score. Find out which other combinations, if any, have means that are not significantly different from highest. Set &=0.05.d. If there is no significant interaction, test claim that expected mean quality-of-life score is same for both dosages.e. If there is no significant interaction, test claim that mean quality-of-life score is same for females and males.
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Assume that a single radar unit used to detect incoming missiles has a probability of 0.90 of correctly detecting an incoming missile attack.
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Calculate the correlation coefficient and prediction equation.
The manufacturer of a laser printer reports the mean number of pages a cartridge will print before it needs replacing is 12,325. The distribution of pages printed per cartridge closely follows the normal probability distribution and the standard d..
Is there significant evidence that this production run doesn't meet specifications? Use a 1% level of significance.
A CBS News/New York Times poll found that 329 out of 763 adults said they would travel to outer space in their lifetime, given the chance. Estimate the true proportion of adults who would like to travel to outer space with 92% confidence.
Assume gasoline prices for a region are normally distributed. Do the data you obtained provide enough evidence to reject the claim? Use a 1% level of signi?cance.
Utilizing your charts stated whether the filling operation has been in control for every of the 18 operating hours this day.
If life of wild pheasants follows a normal distribution with a mean of 9 months and a variance of 9, what percent of the population will be less than 11 months of age.
A pharmaceutical company has developed a screening test for a rare disease that afflicted 2% of the population. Unfortunately, the reliability of this test is only 80%, which means that 20% of the tested will get a false positive.
Assuming that a hypothesis test of the claim has been conducted and that the conclusion is failure to reject the null hypothesis, state the conclusion in nontechnical terms.
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