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In the following examples, indicate whether you would perform a t-test of independent means or dependent means.
a. Two groups were exposed to different levels of treatment for ankle sprains. Which treatment was most effective?
b. A researcher in nursing wanted to know if patients who received additional in-home care recovered more quickly than others who received the standard amount of in-home care.
c. A group of adolescent boys was offered interpersonal skills counseling and then tested in September and May to see if there was any impact on family harmony.
d. One group of adult men was given instructions in reducing their high blood pressure whereas another group was not given any instructions, and their blood pressure was measured before and after.
e. One group of men was provided access to an exercise program and tested two times over a 6- month period for heart health.
Public Health and Nutrition During a medical emergency, people who dial 911 expect an ambulance to arrive quickly and personnel to provide vital care.
The null hypothesis for the normal approximation for the sign test is that the probability of scores falling above and below the median equals what value?
Customers arrive at a bank at a Poisson rate of ?. Let M(t) be the number of customers who enter the bank by time t only to make deposits to their accounts.
(a) What is P[X > 1/2]? (b) What is P[-1/2
Give the name of the kind of sampling that was most likely used in each of the following cases.
a technician plans to test a certain type of resin developed in the laboratory to determine the nature of the time it
suppose each of the numbers 1 2 3 4 5 6 7 8 9 and 10 is written on a separate poker chip and placed in a hat. if one
Students will submit a research paper which will provide a survey of machine learning algorithms and their application to different research areas.
For a sample of 120 students selected at random, what is the mean and variance of the number of students who watch this game?
Let X equal the weight in grams of a 52-gram snack pack of candies. Assume that the distribution of X is N(μ, 4). A random sample of n = 10 observations of X yielded the following data:
All things being equal, when we have a two-tailed Alternative Hypothesis test it is easier to reject the Null Hypothesis (when compared to a one-tailed test).
The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?
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