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(a) A special diet was given to 16 children and their gain in weight was recorded over a 3-month period. Their mean gain in weight was found to be 2.49 kg. A control group consisting of 16 children of similar background and physique had normal meals during the same period and gained 2.05 kg on average. Assume that the standard deviation for weight gains is .8 kg. Is the evidence strong enough for us to assert that the special diet really promotes weight gain?
(b) Answer the question in (a) if each of the two groups consisted of 50 children.
24% of the students in the sample received and A. At the 1% signifiance level, the test hypothesis that more then 20% of the students received and A.
A study of cardiovascular risk factors compared heavy smokers, light smokers, and nonsmokers. Both men and women were included in the study and gender differences were also to be investigated. One of the variables measured was the heart rate after..
A management recruiter wants to estimate a linear regression relationship between an executive's experience and the salary the executive may expect to earn after placement with an employer.
Target population: US college students Sample population: College students at one particular regional university.
test the given claim. identify the null hypothesis alternative hypothesis test statistic p-value or critical value
Let X1,..., Xn be a random sample recorded as heads or tails resulting from tossing a coin n times with unknown probability p of heads. Find the MLE pˆ of p. Also using the invariance property, obtain an MLE for q = 1 - p. How would you use the re..
In Megabucks, a player who correctly chooses five out of the six winning numbers gets $400. What is the probability of winning $400?
if tow televisions are randomly selected, compute the probability that both televisions work. what is the probability that at least one does not work?
1. in the united states the average weight of an adult male is 172 pounds with a standard deviation of 29 pounds.
A certain firm specializing in the manufacture and sale of free time clothing has 80 retail stores in Florida and 140 in California. With each state as a stratum, the firm wishes to estimate average sick-leave time per employee for the past year
State the hypotheses for a right-tailed test. Obtain a test statistic and p-value assuming unequal variances. Why might the sample data not follow a normal, bell-shaped curve? If not, how might this affect your conclusions?
The mean of a normal distribution is 400 pounds. The standard deviation is 10 pounds. a) what is the area between 415 pounds and the mean of 400 pounds?
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