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A statistics practitioner would like to estimate a population mean to within 40 units with 99% confidence given that the population standard deviation is 160.
Construct a 95% confidence interval to estimate the population mean.
A survey of 60 randomly selected business travelers who have been to Chicago on business recently is taken. For the population mean of $281 per day, what is the probability of getting a sample avera
The group found the average psychology grades of a sample of 10 students was 83.4 and the average biology grades of a sample of 13 students was 79.2. What is the null hypothesis for this study?
Tompkins Associates reports that the mean clear height for a Class A warehouse in the United States is 22 feet. Suppose clear heights are normally distributed and that the standard deviation is 4 f
In a research project intended to gather data on the effects of type of study method on examination performance, participants are randomly assigned to one of two conditions.
In a 2^3-1 experimental design . With Word or generator I=ABC, What is the cloumn vector for AB in the design matrix?
The following data represents the time it takes a company to respond to an account inquiry for opening a new account. Using the exponential distribution estimate the average waiting time using the sam
For alpha =0.05 what is your rejection rule? Make a conclusion about the test score distribution by accepting or rejecting your hypotheses
The average weight of adult male bison in a particular federal wildlife preserve is 1550 pounds with a standard deviation of 210 pounds. Find the weight of an adult bull whose z-score is -2.
A sample of 250 observations is selected from a normal population for which the population standard deviation is known to be 23. The sample mean is 19. Determine the standard error of the mean. (Rou
The owner of Britten's Egg Farm wants to estimate the mean number of eggs laid per chicken. A sample of 19 chickens shows they laid an average of 18 eggs per month with a standard deviation of 3 egg
A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 18 hours, with a standard deviation of
Physicians at a clinic gave what they thought were drugs to 940 patients. although the doctors later learned that the drugs were really placebos, 52% of the patients reported an improved condition.
Find the P value for the given test statistics
The average ACT score in Minnesota in 1986 was 19.4. Assuming a standard deviation of 2.0, find (approximate) the probability that the mean of a random sample of 25 scores from Minnesota exceeds 20.
Suppose you have a coin that lands on "heads" with probability p, 0 < p < 1. You don't know the value of p however. So you decide to run an experiment to get an estimate of p using the maximum
A coin was flipped 60 times and came up heads 36 times. What is the test statistic you would use to test whether the proportion of heads is greater than 0.50 at a 10% level of significance?
A student randomly guesses at 20 multiple choice questions. Each question has four possible answers with only one being correct, and each is independent of every other question.
Let p represent the proportion of all pike and trout that die (i.e., p is the mortality rate) when caught and released using barbless hooks. Find a point estimate for p.
In one study of smokers who tried to quit smoking with nicotine patch therapy, 39 were smoking one year after the treatment, and 31 were not smoking one year after the treatment.
Assume that the average weight of students, faculty, and staff on campus is 147 lb, that the standard deviation is 27 lb, and that the distribution of weights of individuals on campus is approximate
A normal population has a mean of 60 and a standard deviation of 11. You select a random sample of 9. Compute the probability the sample mean is : (a). Greater than 63. (b). Less than 57. (c). Betwe
The lengths of pregnancies are normally distributed with a mean of 266 days and a standard deviation of 15 days. Find the probability of a pregnancy lasting 308 days or longer.
If your ANOVA hypothesis test shows no interaction between two factors: Assume that there is no effect due to either of the factors on the response variable