A hospital was concerned about reducing its wait time. A targeted wait time goal of 25 minutes was set. After implementing an improvement framework and process, a sample of 351 patients showed the mean wait time was 23.05 minutes, with a standard deviation of 16.27 minutes. Comple parts (a) and (b) below. a. If you test the null hypothesis at the 0.05 level of significance, is there evidence that the population mean wait time is less than 25 minutes? State the null and alternative hypotheses.

Dr. Graham is interested in determining if middle-aged adults use text messaging more or less frequently than the general population. Dr. Graham collects information on text messaging from a random sample of 50 adults ages 25 to 44. Dr. Graham finds that these individuals send or receive an average of 68 text messages per day. Using the population mean (and standard deviation) of 41.5 texts per day (34 texts per day), determine whether adults in this age group use text messaging more than the general public.

An electronics production sequence includes a process where a film of metal is deposited on a board. The film must be more than 1.000 mm thick. If the film is too thin the process fails. The engineer ran a test where the null hypothesis was that the mean thickness was at most 1.000 mm. A sample of 100 boards had a mean thickness of 1.007 mm and a standard deviation of 0.050 mm.At what level of significance would the null hypothesis be rejected? Express your answer at a decimal (not a percent) rounded to three places.

A college entrance exam company determined that a score of 21 on the mathematics portion of the exam suggests that a student is ready for college-level mathematics. To achieve this goal, the company recommends that students take a core curriculum of math courses in high school. Suppose a random sample of 250 students who completed this core set of courses results in a mean math score of 21.2 on the college entrance exam with a standard deviation of 3.3. Do these results suggest that students who complete the core curriculum are ready for college-level mathematics? That is, are they scoring above 21 on the math portion of the exam? Complete parts a) through d) below. iueiuiy uie LUSI SiauSuc. to = 0.96 (Round to two decimal places as needed.) Identify the P-value, P-value = (Round to three decimal places as needed.)

Watching TV: In 2012, the General Social Survey asked a sample of 1318 people how much time they spent watching TV each day. The mean number of hours was 2.95 with a standard deviation of 2.63. A sociologist claims that people watch a mean of 3 hours of TV per day. Do the data provide sufficient evidence to conclude that the mean hours of TV watched per day differs from the claim? Use the a= 0.01 level of significance and the critical value method. Part: 0 / 5 Part 1 of 5 State the appropriate null and alternate hypotheses. H: H₁ : This hypothesis test is a (Choose one) test. 0<0 ☐☐ X □<口 μ 0=0 Ś

A hospital was concerned about reducing its wait time. A targeted wait time goal of 25 minutes was set. After implementing an improvement framework and process, a sample of 325 patients showed the mean wait time was 23.05 minutes, with a standard deviation of 16.14 minutes. Complete parts (a) and (b) below. a. If you test the null hypothesis at the 0.10 level of significance, is there evidence that the population mean wait time is less than 25 minutes? State the null and alternative hypotheses. Ο Β. Η0: μ 25 H1: µ 25 H1: µ< 25 Ο D . H : μ# 25 H,: µ2 25 Ο Ε. Ho: μ < 25 H,: µ2 25 O F. Ho: µ2 25 H,: µ# 25 Find the test statistic for this hypothesis test. tSTAT = (Type an integer or a decimal. Round to two decimal places as needed.) Find the p-value. The p-value is (Type an integer or a decimal. Round to three decimal places as needed.)

A metropolitan transportation authority has set a bus mechanical reliability goal of 3,900 bus miles. Bus mechanical reliability is measured specifically as the number of bus miles between mechanical road calls. Suppose a sample of 100 buses resulted in a sample mean of 3,950 bus miles and a sample standard deviation of 225 bus miles.   a. Is there evidence that the population mean bus miles is more than 3,900 bus​ miles? (Use a 0.10 level of​ significance.)   State the null and alternative hypotheses.   H0​: μ ___ _____H1​: μ ____ _____     ​(Type integers or​ decimals.)   Find the test statistic for this hypothesis test.   tSTAT=______ ​(Round to two decimal places as​ needed.)   The critical​ value(s) for the test statistic​ is(are) _____   ​(Round to two decimal places as needed. Use a comma to separate answers as​ needed.)   Is there sufficient evidence to reject the null hypothesis using α=0.10​?     A. Reject the null hypothesis. There is sufficient evidence at…

A hospital was concerned about reducing its wait time. A targeted wait time goal of 25 minutes was set. After implementing an improvement framework and​ process, a sample of 364 patients showed the mean wait time was 23.04 ​minutes, with a standard deviation of 16.14 minutes. Complete parts​ (a) and​ (b) below.       Question content area bottom Part 1 a. If you test the null hypothesis at the 0.10 level of​ significance, is there evidence that the population mean wait time is less than 25 ​minutes?   State the null and alternative hypotheses.     A. H0​: μ<25 H1​: μ>25   B. H0​: μ≥25 H1​: μ<25   C. H0​: μ<25 H1​: μ≥25   D. H0​: μ>25 H1​: μ<25   E. H0​: μ≠25 H1​: μ≥25   F. H0​: μ≥25 H1​: μ≠25 Part 2 Find the test statistic for this hypothesis test.   tSTAT=enter your response here ​(Type an integer or a decimal. Round to two decimal places as​ needed.) Part 3 Find the​ p-value.   The​ p-value is enter your…

In a study of computer use, 1000 randomly selected Canadian Internet users were asked how much time they spend using the Internet in a typical week. The mean of the sample observations was 12.8 hours. (a) The sample standard deviation was not reported, but suppose that it was 6 hours. Carry out a hypothesis test with a significance level of 0.05 to decide if there is convincing evidence that the mean time spent using the Internet by Canadians is greater than 12.6 hours. (Use a statistical computer package to calculate the P-value. Round your test statistic to two decimal places and your P-value to four decimal places.) t=P-value= State the conclusion in the problem context. Reject H0. We have convincing evidence that the mean weekly time spent using the Internet by Canadians is greater than 12.6 hours.Do not reject H0. We have convincing evidence that the mean weekly time spent using the Internet by Canadians is greater than 12.6 hours.    Reject H0. We do not have convincing…

An article in the San Jose Mercury News stated that students in the California state university system take 6 years, on average, to finish their undergraduate degrees. A freshman student believes that the mean time is less and conducts a survey of 53 students. The student obtains a sample mean of 4.1 with a sample standard deviation of 1.9. Is there sufficient evidence to support the student's claim at an �=0.1 significance level? Test the claim: Determine the null and alternative hypotheses. Enter correct symbol and value.�0: �=Incorrect��: �    Correct< Incorrect Determine the test statistic. Round to four decimal places.�=Incorrect Find the �-value. Round to 4 decimals.