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Information collected at a local university indicates that business majors enroll for an average (µ) of 10.65 credit hours per semester. As the Dean of the School of Communication, you are interested in how journalism majors compare. Taking a sample of enrollment records on 31 journalism majors, you find a mean (X) credit hour enrollment of 12.22 hours, with a standard deviation (s) of 3.26. Assume that you're working at the .05 level of significance.
a. State an appropriate null hypothesis.
b. What is the value of the calculated test statistic (t)?
c. Identify the critical value.
d. State your conclusion.
the average flight from point a to point b takes 100 minutes with a standard deviation of 10 minutes.a. what is the
Suppose the author plans to continue submitting papers to the journal indefinitely until one is accepted. What is the probability that at least one paper will eventually be accepted by the journal?
A woman has a collection of snakes and iguanas. Her young son observed that the reptiles have a total of 50 eyes and 56 feet. How many reptiles of each type does the woman have?
The n =10 patients had a mean decrease in IOP of = 15.2 mm Hg with a standard deviation of the 10 IOPs equal to s = 9.8 mm Hg after 15 weeks of using the drug. Determine the appropriate sample size for an a α = .01 test to have at most a .10 pr..
a) What are the null and alternative hypotheses? b) What is your test statistic and what distribution does it have if the null hypothesis is true?
What is a "Chi-Squared Test"? Provide a fully referenced explanation and provide a brief example on a Chi-squared test, fully referencing all sources of information.
A traffic study at one point on an interstate highway shows that vehicle speeds are normally distributed with a mean of 61.3 mph and a standard deviation of 3.3 mph.
At the .05 level of significance, is there evidence of a difference in variability in the shipping time between the two outlets? What decision should the carpet manufacturer make? Please provide step by step solution.
If the sales, employment, production, and other business series increase or decrease over a period of time and approximate a straight line, the equation for this growth is given by
A random sample of 51 charge sales showed a sample standard deviation of $47. A 90% confidence interval estimate of the population standard deviation is (Round your answers to 2 decimal places.)
If demand for built space is declining, does this imply that real rents (that is, rents measured net of inflation) will fall in the market? Why or why not?
The five-year disease-free survival rate for women receiving CEF alone as adjuvant therapy was estimated at about 60%, and it is hypothesized that the newly formed regimen would improve that rate from 60% to 70%. Find the total sample size needed ..
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