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Nicotine patches are often used to help smokers quit. does giving medicine to fight depression also help? a randomized double-blind experiment assigned 244 smokers to receive nicotine patches and another 245 to receive botch a patch and the antidepressant drug "bupropion". Results: after a year, 40 subjects in the nicotine patch group had abstained from smoking, as 87 in the patch plus drug group. is this good evidence that adding bupropion increases the success rate?
What is the effect of child care on the security of attachment which develops between infant and caregiver. You suspect that infants in child care will be insecurely attached at 11 months after being in a child care from 2 months of age,
At the .05 significance level, can we conclude that the guideline is still reasonable?
Use a 0.05 significance level to test the claim that the heights of female supermodels vary less than the heights of women in general. The standard deviation of heights of the population of women is 2.5 in.
Using the original data, estimate the population standard deviation with 90% probability.
Michelle is a counselor at the local crises center. She wishes to determine if there is a relationship between the gender of an individual and the amount of alcohol consumed.
If this study involved a repeated measures design (within subjects) comparing conditions with the same number of participants, how many participants would be in each group?
A hypothesis is being conducted. The p-value was found to be 0.0768. For which of the following levels of significance will the null hypothesis be rejected?
The specification limits are set between 15.8 and 16.2 ounces.
Does this sample indicate a smaller average? Use α = 0.05 and assume a normally distributed population.
What is an example of a directional alternate hypothesis? What is an example of a non-directional alternate hypothesis?
Suppose a t- test is being applied to find out if the population monthly expenditure mean is less than $212. The level of significance selected is 1% and 26 accounts are sampled. What is the critical value?
In what situations might you use probability as a manager to approach business-related problems? What are the advantages to using probability concepts in business decisions?
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