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Over a period of years, toothpaste has received a mean rating of 5.9, on a 7-point scale, for overall customer satisfaction with the product. Because of a minor unadvertised change in the product, there is concern that the satisfaction may have changed. Suppose the satisfaction rating from a sample of 60 customers have a mean of 5.60 and a standard deviation of .87. Do these data indicate that the mean satisfaction rating is different from 5.9? Test with a = .05. What is the p-value for the test?
What is the percentage of variation in the dependent variable explained by the variation in the independent variable.
A survey found that the variance of the rental rates on 8 cars at the airport was 35.7 while the variance of the rental rates on 5 cars down town was 50.4. What test value should be used in a F test?
The effectiveness of treating respiratory infections with herbal remedies was studied. "Days of fever" was used to measure effects. Among 356 children treated with herbal remedies, teh mean number of days with was 0.36,
A researcher was interested in determining whether incentives affect the response rate in surveys. A simple random sample of 50 adult residents of a large city was selected. All were mailed a survey and promised a check upon returning a completed ..
Differentiate between the levels of measurement by providing an example of data which can be transformed from one level of measurement to another and another example of data that cannot be transformed.
Sample of 25 rockets in his latest spaceship. He thinks they might weight less than the average rocket. The sample has on average 102 lbs with a standard deviation of 10 lbs. The average rocket weights 106 lbs.
Use three decimal places in your answers for this problem. The following table was collected.
Mean = 14.2, s² = 5.92 and sum of X squared EX² = 2941.60. What can be concluded about age differences in problem solving ability?
Need help discussing Regression Analysis and Bulgaria. I am conducting a country analysis and need to discuss this. Please cite any references used.
The number of widgets produced by 9 employees in an eight hour shift is recorded below. Find the mean number of widgets produced.
What type of shape would you expect the histogram of the sample size to have? What value would you estimate for the mean of the histogram of sample means?
Test the significant difference between Chi-square for attributes
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