you're testing two flu drugs A and B. Drug A works on 41 people out of a sample of 195. Drug B works on 160 people in a sample of 605. Is there evidence that drug B works better. Use a 5% alpha level.

Using alpha .05, what's the critical value for a study that has 4 levels in the IV and 15 subjects?    A. 3.056 B. 3.587    C. 3.287   D. 3.357

Sal knows that parties of people on average spend 75 minutes at their restaurant. They wonder if this average is significantly different on the weekends. They found the average time spent by the 30 parties which dined there this weekend was 82 minutes with a SD of 17 minutes. Assume an alpha of .05. What is the test statistic?

The first test a doctor would order to determine whether a person is infected with HIV (the virus that causes AIDS) is the ELISA test. It detects antibodies and antigens for HIV. A study in Statistical Science by J. Gastwirth estimated that, if the person is actually infected with HIV, this test produces a positive result 97.7% of the time. If a person is not infected with HIV, the test result is negative 92.6% of the time. According the the US Centers for Disease Control (CDC), an estimated 1.1 million Americans out of a population of 321 million were infected with HIV in 2015. Using the information above, determine the probability that a randomly selected person whose ELISA test is positive actually is infected with HIV? a. What is the probability that a randomly selected American is infected with HIV? b. Using the answer to part (a) and the conditional probabilities of positive and negative ELISA test results, fill out the contingency table below:     ELISA Test Result…

Answer parts A through C only, please.   Please SHOW ALL WORK and ensure the ANSWER is CORRECT. Thank you!

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The average American man weighs 197.9 pounds; this can be treated as the population mean. I want to assess whether or not American men at a southwestern college weigh significantly different from the average weight. Test this hypothesis at an alpha of 0.05.  The average American man weighs 197.9 pounds; this can be treated as the population mean. I want to assess whether or not American men at a southwestern college weigh significantly different from the average weight. Test this hypothesis at an alpha of 0.05.  null hypothesis: H0: μ= 197.9 alternative hypothesis: H1: μ ≠ 197.9 Data: 178, 189, 198, 205, 210, 204, 189, 183, 190, 200, 166, 189, 174, 145, 160 degrees of freedom:  N-1 , 15-1, 14 What is the critical t value (t table)? ________ What is the obtained t value? ____________ What can you conclude?

A group of researchers wants to know whether men (population 1) are more likely than women (population 2) to contract a novel coronavirus. They surveyed two random samples of 490 men and 480 women who were tested and found that 52 men and 91 women in the samples tested positive. Can you conclude that the proportion of positive tests among men is less than the proportion of positive tests among women? Use level of significance 5%. Procedure: Select an answer Step 1. Hypotheses Set-Up: where Select an answer the Ho: Select an answer Select an answer and the units are Select an answer Ha: Select an answer , and the test is Select an answer Step 2. The significance level a (Round the answer to 3 Step 3. Compute the value of the test statistic: Select an answer decimal places) Step 4. Testing Procedure: (Round the answers to 3 decimal places) CVA PVA Provide the critical value(s) for the Rejection Region: Compute the P-value of the test statistic: left CV is and right CV is P-value is Step…

A rare birth defect occurs in approximately 0.5% of all cases in males. If we sample all the males born in 2016 in a specific region (200,000), fill out the chart below and answer the following questions. A test can be done with 96% accuracy to determine if a child has the birth defect. Out of all people, what are the chances that males get a positive test result?

Español An antidepressant has historically been known to relieve depression for 65% of patients who use the drug. The drug's formula was changed recently to include a smaller dose of its main, active ingredient. Due to this change, a medical researcher suspects that among all people with depression who use the new version of the drug, the proportion, p, of people who find relief is lower than 65%. A random sample of 250 patients who use the new version is selected by the researcher, and 143 of them find relief from depression. Based on these data, can we support the researcher's claim at the 0.05 level of significance? Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places and round your answers as specified in the table. (If necessary, consult a list of formulas.) An (a) State the null hypothesis Ho and the alternative hypothesis H. H : 区 H, : (b) Determine the type of test statistic to use. (Choose one) (c) Find…