Finding Critical Values and Confidence Intervals. In Exercises 5–8, use the given information to find the number of degrees of freedom, the critical values
5. Nicotine in Menthol Cigarettes 95% confidence; n = 25, s = 0.24 mg.
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ESSENTIALS OF STATISTICS 6TH ED W/MYSTA
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- HW Score: 49.83%, 24.92 of 50 pts Homew 14 of 14 (10 complete) ▼ Question Help ▼ A humane society claims that less than 65% of households in a certain country own a pet. In a random sample of 500 households in that country, 310 say they own a pet. At a= 0.10, is there enough evidence to support the society's claim? Complete parts (a) through (c) below. Score: 0 of 4 pts 7.4.15-T (a) Identify the claim and state Ho and Ha. Identify the claim in this scenario. Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or a decimal. Do not round.) O A. % of households in the country own a pet. %. O B. The percentage households in the country that own a pet is not O C. More than % of households in the country own a pet. O D. Less than % of households in the country own a pet. ? Click to select and enter your answer(s) and then click Check Answer. Clear All Check Answer parts 4 remaining MacBoo 吕0 D00 DI DD esc F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12…arrow_forwardUsing Correct Distribution. In Exercises 5–8, assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) Find the critical value tα/2 , (b) find the critical value zα/2 , or (c) state that neither the normal distribution nor the t distribution applies. Miami Heat Salaries Confidence level is 95%, σ is not known, and the normal quantile plot of the 17 salaries (thousands of dollars) of Miami Heat basketball players is as shown.arrow_forwardFinding P-values. In Exercises 5–8, either use technology to find the P-value or use Table A-3 to find a range of values for the P-value. Tornadoes The claim is that for the widths (yd) of tornadoes, the mean is μ < 140 yd. The sample size is n = 21 and the test statistic is t = −0.024.arrow_forward
- topic: estimationarrow_forwardFinding P-values. In Exercises 5–8, either use technology to find the P-value or use Table A-3 to find a range of values for the P-value. Old Faithful The claim is that for the duration times (sec) of eruptions of the Old Faithful geyser, the mean is μ = 240 sec. The sample size is n = 6 and the test statistic is t = 1.340.arrow_forwardIs this correct so far?arrow_forward
- Using the Runs Test for Randomness. In Exercises 5–10, use the runs test with a significance level of α=0.05. (All data are listed in order by row.) Newspapers Media experts claim that daily print newspapers are declining because of Internet access. Listed below are the numbers of daily print newspapers in the United States for a recent sequence of years. First find the median, then test for randomness of the numbers above and below the median. What do the results suggest?arrow_forwardFinding a Prediction Interval. In Exercises 13–16, use the paired data consisting of registered Florida boats (tens of thousands) and manatee fatalities from boat encounters listed in Data Set 10 “Manatee Deaths” in Appendix B. Let x represent number of registered boats and let y represent the corresponding number of manatee deaths. Use the given number of registered boats and the given confidence level to construct a prediction interval estimate of manatee deaths. Boats Use x = 98 (for 980,000 registered boats) with a 95% confidence level.arrow_forwardUsing Correct Distribution. In Exercises 5–8, assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) Find the critical value tα/2 , (b) find the critical value zα/2 , or (c) state that neither the normal distribution nor the t distribution applies. Denver Bronco Salaries Confidence level is 99%, σ = 3342 thousand dollars, and the histogram of 61 player salaries (thousands of dollars) is shown in Exercise 6.arrow_forward
- Finding P -values. In Exercises 5–8, either use technology to find the P-value or use Table A-3 to find a range of values for the P-value. Body Temperatures The claim is that for 12AM body temperatures, the mean is μ < 98.6°F. The sample size is n = 4 and the test statistic is t = −2.503.arrow_forwardExercise 2.1 (Sample Space and Events) The rise times (unit: min.) of a reactor for two batches are measured in an experiment. Define the sample space of the experiment. Define E1 where the reactor rise time of the first batch is less than 55 min. and E2 where the reactor rise time of the second batch is greater than 70 min. Find E1 E2, E1 E2, and E1’ Are E1 and E2 mutually exclusive? Are E1 and E2 exhaustive?arrow_forwardFind quartile 1 (Q1) of the data set. {-4, -6, -9, -3, -2, -4, 0} O -6 ere to search F2 F3 F4 F5 F6 F7 F8 F9arrow_forward
- Linear Algebra: A Modern IntroductionAlgebraISBN:9781285463247Author:David PoolePublisher:Cengage LearningGlencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw Hill