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The owner of a chain of ice cream stores would like to study the effect of atmospheric temperature on sales during the summer season. A sample of 21 consecutive days is selected, with the following results (Hint: Determine which are the independent and dependent variables)Temperature Sales63 1.5270 1.6873 1.875 2.0580 2.3682 2.2585 2.6888 2.990 3.1491 3.0692 3.2475 1.9298 3.4100 3.2892 3.1787 2.8384 2.5888 2.8680 2.2682 2.1476 1.98a. Assuming a linear relationship, use the least-square method to find the regression coefficients b0 and b1.b. Predict the sales per store for a day in which the temperature is F.c. Plot the residuals versus the independent variable by using Excel. (Shown in the Excel file)d. Draw the normal probability plot by using Excel. (Shown in the Excel file)e. Based on the results of (c) and (d), is there reason to question the validity of the model?
If 100 percent of a days production is inspected whenever the sample of 10 gives 2 or more defectives, then what is the pobability that 100 percent of a days production will be inspected?
What is the probability that a U.S. user who downloads music, selected at random, obtained it from either the United States or Canada.
If a random sample of 10 people found that 9 were pro-life (i.e., 90%), while another random sample of 1,000 people from the same population found that 550 were pro-life (i.e., 55%), which would you find more significant?
Many people attend work and produce little or nothing of value that is why they are terminated.
The linear correlation coefficient, r, measures the strength of the linear relationship the variables in a set of ordered pairs (x,y). What is the maximum and minimum values for r?
Discuss the strengths and weaknesses of correlational and regression studies; discuss concepts such as positive and negative correlations, correlation coefficients, confounding, and causality.
Total housing costs as a percent of monthly income, five years ago and now. The information is reported below. Is it reasonable to conclude the percent is less now than five years ago?
A standard deviation of 1 month will have a total lifetime of at least 45 months if all of the bulbs are used non stop.
Do these measures of central tendency agree? Explain. What could the measures of dispersion tell us about the results of the quiz?
Make a graph to visualize the problem and state, without doing the calculations, whether the p-value of the test
Should the engineering firm be concerned? Perform an appropriate hypothesis test, showing the necessary calculations and or explaining the process used to obtain the results.
Find a % confidence interval for the difference in average absorption time for the two drugs. Does it appear that one drug is absorbed faster than the other at the % significance level.
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