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In a randomly controlled trial conducted with children suffering from croup, 46 randomly selected children were treated with ow humidity while another group of randomly selected children were treated with high humidity. Using a Wesley Croup test score, the low humidity group had a mean score of 0.98 with a standard deviation of 122, while the high humidity group had a mean score of 1.09 with a standard deviation of 1.11. The claim hypotheses at the 0.05 level to test the claim.
a) Correctly state the hypotheses and label the claim
b) Draw a diagram correctly showing the sampling distribution
c) Calculate the test statistics
d) Give the p value
e) Tell if you reject/fail to reject the null hypothesis
f) In plain English what can be said of the claim.
At the 5% level of significance, can we infer that the population mean weight of athletic men is lower than the population mean weight of non-athletic men by more than 2 pounds?
Compute test statistic and p -value for each sample. (Negative amount must be pointed out by minus sign.)
Develop a decision tree for the case of a company operating at full capacity and with product demand rising. The choice is between new equipment and overtime.
They have collected data on gender, shoe size, and height to see if they can change their business model to include only one size of shoes regardless height or gender of the wearer.
At the end of 24 weeks of treatment, subjects were classified as responders or non-responders to treatment based on a battery of psychological tests.
Determine the probability of exactly one success given Poisson distribution with mean of 2.0.
At.05 significance level is it reasonable to conclude that it takes longer to determination software issues? Determine the p-value?
At a board meeting of 20 businessmen, all of whom wear ties, what is the probability that:
In the history class the mean score was 76 with standard deviation 3.
A multiple regression equation for list price of homes in certain community in USA is=170,000 -850 X 1 + 28,000 X 2 , where X 1 signifies age in years and X 2 signifies number of rooms.
A random sample of 58 fish is taken from the tank. Let x be the mean sample length of these fish. What is the probability that x is within 0.5 inch of the claimed population mean? (Round your answer to four decimal places.)
Recognize strategies that were utilized to control for nuisance variables and minimize threats to valid inference making.
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