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Adult females have an overhead reach distance: mean of 200.5 cm with standard deviation of 8.6 cm. Assume the reach distances are normally distributed.
a. If 1 adult female is randomly selected, find the probability that her overhead reach is less than 222.7 cm. b. If 49 females are randomly selected, find the probability that they have a mean overhead reach less than 207 cm.
suppose a random sample of n 60 adults are polled and asked if they believed that recycling made the biggest
Assume we interested in relationship between the age of individual, as measured by visits. Suppose after selecting 15 members the observation:
a study showed that the correlation coefficient for iqs of husbands and wives was 0.6. in each case determine whether
The animal colony in the reseach department contains 20 male rats and 30 female rats. Of the 20 males, 15 are white and 5 spotted. Of the 30 females, 15 are white, and 15 are spotted.
Set a value for the level of significance to be used in the test? After answering this question, what type of error would you suppose may result in that case?
Probabilities can be approximated by the normal probability distribution? Explain What is the probability of between 100 and 110 successes? What is the probability of 130 or more succeses?
A decision maker is working on a problem that requires her to study the uncertainty surrounding the payoff of an investment. There are three possible levels of payoff -$1,000, $5,000, and $10,000.
question 1 the data displayed below represents the electricity cost during a recent month for a random sample of 50
Using the .05 level of significance, what should we conclude about the theory that 24 hours is the natural cycle? (That is, does the average cycle length under these conditions differ significantly from 24 hours?)
question 1in a study of distances travelled by buses before the first major engine failure a sampling of 191 buses
Plot Kaplan-Meier Survival curve estimates along with true survival curve for n=25,100,1000
For each problem, compute a Welch F-statistic and determine whether or not significant differences exist among the treatment conditions.
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