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Consider an SRS of size 50 of cell phone users in which they are asked how many minutes per day they use their cell phones. The sample mean is 114.3 minutes. The sample standard deviation is 26.4 minutes.
Calculate the lower endpoint of a 90% confidence interval for the population mean (number of minutes using the cell phone.
the following data show the number of fruit fly killed at varying concentrations of nicotine.the number of ies killed
Please calculate mean, median, mode & standard deviation, range, variance for following 10 sample home prices. Please perform the calculations in EXCEL and attach the file for the credit.
Suppose that lifetimes of light bulbs produced by a certain company are normal random variables with mean 1000 hours and standard
A retailer has data on sales in its stores yesterday. It would like a range that has a 50% chance of covering the sales of a randomly selected store today. Which does the retailer need, a prediction interval or a confidence interval?
Suppose that 25% of the population in a given area is exposed to a television commercial for Ford automobiles, and 34% is exposed to Ford's radio advertisement.
the operationalization of a construct means that there must be looked for as many related dimensions and elements of
A company producing digital thermometers believe its new design significantly reduces the variation in reported temperatures at very low temperatures.
Assuming that equal sample sizes will be selected from each plant, what should the sample size be if the bound on the error of estimation is 40 minutes with a probability of 0.90?
Seed weights (2.2) Biological measurements on the same species often follow a Normal distribution quite closely. The weights of seeds of a variety of winged.
Use Are the data statistically significant at the given level of significance? Based on your answers, will you reject or fail to reject the null hypothesis?
How large sample size must be taken to be 95% confident.
Midnight blue and dark green are the two most popular colors. How many different backpacks in these colors does the company offer?
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