If the p-value found in an experiment is 0.85. We reject the null hypothesis. True False
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- The currently used medicine is successful for 26% of patients. A new experimental medication is tried on a random sample of 500 patients and is successful for 140 of them. Is the success rate for the new experimental medicine different from 26%? Conduct a hypothesis test with a = 0.01. Be sure to provide answers to the 4-steps of the hypothesis testing technique as presented in class as %3!Suppose it is claimed that 40% of adults support the practice of changing clocks twice a year in observance of Daylight Saving Time. Believing this claimed value is too high, a sociologist surveys a random sample of 310 adults and finds that 113 of these adults say they support the practice of changing clocks twice a year in observance of Daylight Saving Time. Remember that with hypothesis testing, we always begin with a set of two competing hypotheses. We have a hypothesis that puts forward the claim that is being tested about the population. We call this hypothesis the __________________ hypothesis. We then have a hypothesis that illustrates what we think is really going on in the population. We call this hypothesis the ______________________hypothesis. Using appropriate symbols, our hypotheses in this example are as follows: Ho: p = 0.40 Ha: p < 0.40 Look carefully at the hypotheses presented above. What does the symbol “p” stand for in these…If we perform a paired t test and retain the null hypothesis, then what does this mean if we made measurements on each subject before and after a particular treatment? Group of answer choices There is NO difference in outcomes before and after the treatment was given There is a difference in outcomes before and after the treatment was given
- Find the P-value of z-score (3.55) if doing a two-tail hypothesis test.A recent drug survey showed an increase in the use of drugs and alcohol among local high school seniors as compared to the national percentage. Suppose that a survey of 100 local seniors and 100 national seniors is conducted to see if the proportion of drug and alcohol use is higher locally than nationally. Locally, 65 seniors reported using drugs or alcohol within the past month, while 60 national seniors reported using them. Conduct a hypothesis test at the 5% level.NOTE: If you are using a Student's t-distribution for the problem, including for paired data, you may assume that the underlying population is normally distributed. (In general, you must first prove that assumption, though.) Part (a) State the null hypothesis. H0: plocal ≠ pnational H0: plocal > pnational H0: plocal = pnational H0: plocal < pnational Part (b) State the alternative hypothesis. Ha: plocal < pnational Ha: plocal = pnational Ha: plocal ≠ pnational Ha: plocal > pnational…Suppose a hypothesis test is performed with a level of significance of 0.05. Then if the null hypothesis is actually true, then there is a 5% chance that the researcher will end up accepting the alternative hypothesis in error. True or False
- Decide whether you would reject or fail to reject the null hypothesis in the following situations: = 3.50, sD = 1.10, n = 12, a = .05, two-tailed test 95% CI = (0.20, 1.85) t = 2.98, t* = −2.36, one-tailed test to the left 90% CI = (−1.12, 4.36)suppose a hypothesis test is conducted where the level of significance a= 0.05 and the test results in p- value = 0.04 should the researcher reject the null hypothesis? A. yes because the p-value is less than a b. no should not reject because the p-value is greater than a c. no should not reject because is less than a d. yes should reject because the p-value is greater than a-Find the correct null hypothesis and for each correct alternative hypothesis 3. Suppose you hear a claim that the average score on a national exam is 78. You think the average is higher than that. Set up your null and alternative hypotheses.
- Suppose we want to test the null hypothesis H0 : p = 0.34 against the alternative hypothesis H1 : p < 0.34. Suppose also that we observed 120 successes in a random sample of 300 subjects and the level of significance is 0.01. What is the p-value for this test?A college professor states that this year's entering students appear to be smarter than entering students from previous years. The college's records indicate that the mean IQ for entering students from earlier years is 110.4. Suppose that we want to sample a small number of this year's entering students and carry out a hypothesis test to see if the professor's statement can be supported. State the null hypothesis H0 and the alternative hypothesis H1 that we would use for this test. H0= H1=A recent study showed that in a random sample of 100 people, 30% had visited Worlds of Fun. In another random sample of 150 people 24% had visited Knott’s Berry Farm. At ∝ = 0.05 are the proportions of people who visited each park different? The samples were independent. In a two sample hypothesis test the p-value was 0.2917. In this test your decision would be to reject the null hypothesis fail to reject the null hypothesis accept the alternate hypothesis as true none of the above
