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A sociologist wants to know the average number of times families eat out per week. Data was collected from 50 families. The sample mean is 4.4 meals per week with a sample standard deviation of 2.2. Construct a 95% confidence interval to estimate the population mean.
With the same information refigure but assume 2.2 is the POPULATION standard deviation.
Construct a 95% confidence interval for the population mean time spent waiting. State the confidence interval, sketch the graph, and calculate the error bound.
At the end of the week, the scientists said that 18% of the 234 fish that were submitted for inspection displayed the discoloration. From this information, can the researchers estimate what proportion of fish in the river have discolored scales? E..
What are the assumptions of regression analysis and how do you evaluate them?
As an aid for improving students' study habit, nine students were randomly selected to attend a seminar on the importance of education in life. The table shows the number of hours each student studied per week before and after the seminar.
Multicultural perceptions in education. Yang and Montgomery (2012) studied how teachers and prospective teachers perceive diversity in an educational.
For two dependent groups you get- Apply the Wilcoxon signed rank test with α = 0.05. Verify that W = 0.7565 and that you fail to reject.
Translate the following statements into symbolic form using capital letters to represent affirmative English statements.- Psychologists and psychiatrists do not both prescribe antidepressant drugs.
A time series trend equation for Hammer Hardware is Y' = 5.6 + 1.2t, where sales are in millions of dollars and t increases by one unit for each year. If the value of sales in the base year of 2016 is $5.6 million, what would be the estimated sale..
For each format, create a scatterplot showing the amount of space needed (in MB) for storage based on the length (in seconds) of the song. Comment on what you see in the scatterplots.
Also, find the? 95% confidence interval for the mean time required to graduate for all college graduates.
Bags of cookies that have weights in the upper 7.5% are too heavy and must be repackaged. What is the most a bag of cookies can weigh and not need repackaging?
a government agency has specialists who analyze the frequencies of letters of the alphabet in an attempt to decipher
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