A research center claims that at least 27% of adults in a certain country think that their taxes will be audited. In a random sample of 1200 adults in that country in a recent year, 23% say they are concerned that their taxes wilI be audited. At a=0.10, is there enough evidence to reject the center's claim? Complete parts (a) through (e) below. 東 票 O D. The percentage of adults in the country who think that their taxes will be audited is not %. Let p be the population proportion of successes, where a success is an adult in the country who thinks that their taxes will be audited. State H, and H,. Select the correct choice below and fill in the answer boxes to complete your choice. (Round to two decimal places as needed.) Courses rse Home O A. Ho PS OB. Ho P< O C. Ho P> gnments Ha p> Ha p2 Ha ps CD. Ho p2 0.27 OE Ho P- OF Ho Pt debook H p< 0.27 H, pt H3 p= pter Contents (b) Find the critical value(s) and identify the rejection region(s). Identify the critical value(s) for this test. imedia Library (Round to two decimal places as needed. Use a comma to separate answers as needed.) y Plan View an example Get more help - Clear all Check answer s for Success Help me solve this ssible Resources OK E for SuccACE 62°F (99+ P Type here to search 00פל "vחאי XL-BT 10/05/17

Do you think the results of the study might be applicable to the whole population? Why or why not?

You may need to use the appropriate appendix table or technology to answer this question. In a study entitled How Undergraduate Students Use Credit Cards, it was reported that undergraduate students have a mean credit card balance of 3,173ドル. This figure was an all-time high and had increased 44% over the previous five years. Assume that a current study is being conducted to determine if it can be concluded that the mean credit card balance for undergraduate students has continued to increase compared to the original report. Based on previous studies, use a population standard deviation ? = 1,000ドル. (a) State the null and alternative hypotheses. H0: ? < 3,173 Ha: ? ≥ 3,173 H0: ? = 3,173 Ha: ? ≠ 3,173 H0: ? > 3,173 Ha: ? ≤ 3,173 H0: ? ≥ 3,173 Ha: ? < 3,173 H0: ? ≤ 3,173 Ha: ? > 3,173 (b) What is the test statistic for a sample of 170 undergraduate students with a sample mean credit card balance of 3,305ドル? (Round your answer to two decimal places.) What is...

A Pew Research Center report published on February 2, 2022 says, "In a national survey by Pew Research Center, 54% of U.S. adults say they have a favorable opinion of the Supreme Court while 44% have an unfavorable view, and 84% say justices should not bring their political views into decisions." Answer the given problems based on the assumption that the above figures represent the true proportion of current U.S. people’s opinion. 4.1. If 20 U.S. adults are selected at random, what is the probability that less than half the selected people have favorable view on U.S. Supreme Court? 4.2. If 20 U.S. adults are selected at random, what is the probability that more than half the selected people have unfavorable view on U.S. Supreme Court? 4.3. If 5,128 U.S. adults were interviewed, what are the expected value of the number of people that answered that the justices should not bring their political views into decisions? What is the probability standard deviation in this case?

Twelve percent of the world's population is left-handed. A researcher claims that left-handed individuals are more creative than those who aren't left-handed. In order to support his claim, he takes a sample of 1650 artists and finds that 14% of.them are left-handed. Español Answer the following. (If necessary, consult a list of formulas.) (a) Find the mean of p, where p is the proportion of left-handed individuals in a random sample of 1650. 00 (b) Find the standard deviation of p. (c) Compute an approximation for P (p s0.14), which is the probability that there will be 14% or fewer left-handed people in a random sample of 1650. Round your answer to four decimal places. Save For Later Submit Assignment Check Terms of Use Privacy Center Accessibility acer esc backspa

A social worker notes that in a population of psychiatric inpatients the ethnic mix seems out of balance with what she has understood to be the ratios in the general population. Respond to the prompts below to show how she might determine whether the inpatient ethnic mix varies from the mix in the general population. Write an example of how the null and alternative hypotheses for this test could be stated. What would the researcher need to know in order to calculate the appropriate test statistic? I.e., what values need to be known or calculated in order to complete the calculation of the test statistic?

What is the base rate(or prevalence in medical literature) and sensitivity(the percentage of individuals with a disease who are correctly classified as having the disease?)

Your medical research team is investigating the mean cost of a​ 30-day supply of a certain heart medication. A pharmaceutical company thinks that the mean cost is more than 95ドル. You want to support this claim. How would you write the null and alternative​ hypotheses?

A psychologist is studying the self image of smokers, as measured by the self-image (SI) score from a personality inventory. She would like to examine the mean SI score, μ, for the population of all smokers. Previously published studies have indicated that the mean SI score for the population of all smokers is 80 and that the standard deviation is 15, but the psychologist has good reason to believe that the value for the mean has changed. She plans to perform a statistical test. She takes a random sample of SI scores for smokers and computes the sample mean to be 88. Based on this information, complete the parts below. (a) What are the null hypothesis H. and the alternative hypothesis H1 that should be used for the test? Ho : H1 :0 (b) Suppose that the psychologist decides not to reject the null hypothesis. What sort of error might she be making? Type I Suppose the true mean SI score for all smokers is 80. Fill in the blanks to describe a Type I error. the hypothesis that u is (Choose...