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Many consumers pay careful attention to stated nutritional contents on packaged foods when making purchases. It is therefore important that the information on packages be accurate. A random sample of n = 12 frozen dinners of a certain type was selected from production during a particular period, and the calorie content of each one was determined. (This determination entails destroying the product, so a census would certainly not be desirable!) Here are the resulting observations, along with a boxplot and normal probability plot. (To obtain the dataset for your analysis software, go to the Book Companion Website.) 255 244 239 242 265 245 259 248 225 226 251 233
(a) Is it reasonable to test hypotheses about true average calorie content μ by using a t test? Yes, it is reasonable. No, t test is not applicable here. It depends on the results of t test.
(b) The stated calorie content is 241. Does the boxplot suggest that true average content differs from the stated value? Yes, it is clear that true average content differs from the stated value. No, it is possible that true average content is 241. There's not enough evidence to decide.
(c) Carry out a formal test of the hypotheses suggested in part (b). (Use Table 4 in Appendix A. Use α = 0.05. Round your test statistic to two decimal places and your P-value to three decimal places.) t = df = P = Conclusion: Reject H0. Fail to reject H0.
Regression equation Credits=15.4-.07. Select the correct statement. Increase in number of hours worked per week increases the expected number of credits.
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Finding appropriate z- and t-scores is important when constructing confidence intervals. Confidence intervals allow one to estimate important population parameters such as population mean, population proportion, population standard deviation, etc. We..
A biologist estimates that 50% of deer in the region carry a certain type of tick. for a sample of 300 deer selected at random, what is the chance that 155 or fewer deer have this tick?
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numerous studies have demonstrated that listening to music while studying can improve memory hallam price amp katsarou
The shop wants a minimum of 60 man-years experience and wishes to maximize productivity. What machinists should they hire?
The registrar of a college with a population of N=4,000 full-time students is asked by the president to conduct a survey to measure satisfaction with the quality of life on campus.
The producer of a TV special expected about 40 percent of the viewing audience to watch a rerun of a 1965 Beatles Concert. A sample of 200 homes revealed 60 to be watching the concert.
Use the data to estimate the true population mean gas tax with 90% confidence. Does your interval contain the national average of 21 cents?
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The mean amount of time a (unnamed) computer server is down is 18.3 minutes with a standard deviation of 5.7 minutes.
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