Previously , 10.1% of workers had a travel time to work of more than 60 minutes . An urban economist believes that the percentage has increased since then . She randomly selects 90 workers and finds that 15 of them have a travel time to work that is more than 60 minutes . Test the economist's belief at the alpha = 0.05 level of significance.  What is the P-value?

8.4.1 Approximately 91% of all adults in South Korea have a cell phone. In a simple random sample of 200 adults in the United States, 171 owned cell phones. Is there convincing evidence to suggest the proportion of adults who own cell phones in the U.S. is lower than the proportion of adults who own cell phones in South Korea? Conduct a significance test using the 4-step process.

An experiment was conducted to test if 2 new anti-anxiety medications will have an effect on number of anxiety symptoms. The researcher randomly assigned participants to one of the three experimental groups. Groups 1 and 2 took the 2 new medications while Group 3 took a placebo pill. The researcher was interested in determining whether there would be a difference in the number of anxiety symptoms among the three groups. Assume an alpha level of 0.05 and a two-tailed test. What statistical test should you use to evaluate the hypothesis above?     one-way independent ANOVA     Pearson Product-Moment Correlation     simple linear regression     multiple linear regression     three-way independent ANOVA

2. A principal of high school was concerned with amount of time her students devote to working at after-school jobs. She randomly selected 25 students, obtained their working hours for 1 week and computed x = 12.5 hours and s = 4.5 hours. She claims that her students work significantly more than the mean of 10.7 hours from a study conducted by the National Association of State High School Association. Test her claim by using the 5% level of significance.

In one study of smokers who tried to quit smoking with nicotine path​ therapy,38 were smoking one year after the​ treatment, and 32 were not smoking one year after the treatment. Use a 0.10 significance level to test the claim that among smokers who try to quit with nicotine patch​ therapy, the majority are smoking a year after the treatment. d. Calculate the test statistic z. Which of these options is closest to​ z?     A. negative 2.02     B. 0.72     C. negative 0.25     D. 2.59     e. Calculate the​ P-value. Which of these options is closest to the​ P-value?     A. 0.2358     B. 0.2164     C. 0.3359     D. 0.2271     f. State the technical conclusion     A. Reject Upper H 0     B. Do not reject Upper H 0     g. State the final conclusion     A. There is sufficient evidence to warrant rejection of the claim.   B. There is not sufficient evidence to warrant rejection of the claim.…

You read an online article that claims that 62% of 8-year-olds have social media accounts. You want to investigate that specific claim, so you set up a one-way chi square analysis and recruit 130 8-year-old participants for your sample. What is the expected frequency for the number of 8-year-olds in your sample who have social media accounts? mard Next

Dr. Maddan's eye drops are supposed to cause significant reduction is eye redness. The following table shows the results of a recent study where a random sample of individuals took part in a placebo controlled study. No Reduction in Redness Reduction in Redness Total Eye Drops 120 220 340 No Eye Drops Total 120 140 260 240 360 600 With 5% level of significance, determine if eye redness reduction is dependent upon taking the eye drops. Provide, a. the Chi-square statistic. b. the critical value or the p-value. c. Your decision on whether or not to reject Ho.

According to the USDA World Agricultural Supply and Demand Estimates report found that Americans consumed an average of 279 eggs per person in 2019. The farmers at Eggcellent Acres believes the number of eggs consumed by Americans has increased over the last few years. Based on the Minitab printout below, test to determine if the average number of eggs consumed by Americans has increased. Test at the 0.10 level of significance. (Show all six steps.) One-Sample T: Eggs Consumed Descriptive Statistics N Mean StRex SE Mean 78 285.00 22.59 2.56 i population mean of Sample Test Null hypothesis Ho: M = 279 Alternative hypothesis Hi: u > 279 T-Value P-Value 2.35 0.011 95% Lower Bound for y 280.74

If a researcher wants to conduct a two-tailed single sample + test with data from 30 participants and an alpha level of 0.05, what is the correct critical value? a. 2.043 b. 1699 c. 2045 d. 1.698