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Heights were measured for a random sample of 20 plants grown while being treated with a particular nutrient. The sample mean and sample standard deviation of those height measurements were 39 centimeters and 12 centimeters, respectively.
Assume that the population of heights of treated plants is normally distributed with mean M. Based on the sample, can it be concluded that M is different from 45 centimeters? Use the 0.1 level of significance.
Perform a two-tailed test. Then fill in the table below.
The null hypothesis is:
The alternative hypothesis is:
The type of test statistics: z, t, chi square, f
The result of the test statistics (rounded to at least three decimals)
The p-value(rounded to at least three decimals)
For each lettered part, a through c, examine the two given sets of numbers. Without doing any calculations, decide which set has the larger standard deviation and explain why. Then check by finding the standard deviation by hand .
General Motors pays for employee education. The HR director would like to conduct a study on the average GPA of employees who have used this benefit to complete their degrees using a sample of education records over the past 10 years.
To forecast attendance at an yearly tennis tournament a model has been developed that uses attendance from the previous year and the amount spent for advertising this year.
The Dean of Students believes that the costs are greater this semester. What is the test value for this hypothesis?
Compute a 3 month moving average forecast of demand for April through January (of the next year). Compute a 5 month moving average forecast for June through January
The correlation between the returns on Ceramics Craftsman, Inc., and the returns on the S&P 500 is 0.675. The variance of the returns on Ceramics Craftsman, Inc., is 0.004225, and the variance of the returns on the S&P 500 is 0.001467.
Fitting of multiple linear regression equation - Give a list of the model assumptions for a regression model.
Describe what do you mean by conditional probability. Give clinical example to support the explanation.
Calculate the average or the median of the average or medians of the samples and compare it with the average of the population.
Does this data provide evidence at the .05 significance level that there is a difference in the proportion of humorous ads in British versus American trade magazines? Please show work.
The final grades for a random sample of MKT 380 students are as follows: What is the standard deviation for these data?
A survey of college students collected information on several variables: Distance from Home, Age, Major, Gender, and Class. The variable Major is
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