Previously, 5% of mothers smoked more than 21 cigarettes during their pregnancy. An obstetrician believes that the percentage of mothers who smoke 21 cigarettes or more is less than 5% today. She randomly selects 150 pregnant mothers and finds that 5 of them smoked 21 or more cigarettes during pregnancy. Test the researcher's statement at the a = 0.05 level of significance. What are the null and alternative hypotheses? = 0.05 versus H,: p < 0.05 Ho: P (Type integers or decimals. Do not round.) Because npo (1- Po) = L (Round to one decimal place as needed.) V 10, the normal model V be used to approximate the P-value.

A random sample of n1 = 299 voters registered in the state of California showed that 140 voted in the last general election. A random sample of n2 = 220registered voters in the state of Colorado showed that 130 voted in the most recent general election. Do these data indicate that the population proportion of voter turnout in Colorado is higher than that in California? Use a 10% level of significance. What is the level of significance? What is the value of the sample test statistic? (Test the difference p1 − p2. Do not use rounded values. Round your final answer to two decimal places.) Find (or estimate) the P-value. (Round your answer to four decimal places.)

A football coach claims that the average weight of all opposing teams’ members is 225 pounds. For a test of the claim, a simple random sample of 50 players is taken from all the opposing teams. The mean is found to be 230 pounds with a standard of 15 pounds. Construct a 95% confidence interval for the unknown average weight of the population of all the players of opposing teams. Interpret your result.

More than 59% of adults would erase all their personal information. The hypothesis test results in a p value of .0241. State a conclusion about the null hypothesis. Without using technical terms state a final conclusion

A newsletter publisher believes that less than 68 % of their readers own a Rolls Royce. For marketing purposes, a potential advertiser wants to confirm this claim. After performing a test at the 0.05 level of significance, the advertiser failed to reject the null hypothesis. What is the conclusion regarding the publisher's claim?

In 1995, it was determined that 78% of US citizens supported a ban on household aerosols.  Thinking that this proportion may have changed over the past few decades, a sample will be taken to test if a change has occurred. In a SRS of 500 citizens taken this year, 350 supported the ban.  Determine the pvalue associated with the test. find null and alternate hypothesis.

A random sample of 818 births included 435 boys. Use a 0.05 significance level to test the claim that 50.6​% of newborn babies are boys. Do the results support the belief that 50.6​% of newborn babies are​ boys? Identify the null and alternative hypotheses for this test. Choose the correct answer below.     A. H0​: p=0.506 H1​: p>0.506   B. H0​: p≠0.506 H1​: p=0.506   C. H0​: p=0.506 H1​: p≠0.506   D. H0​: p=0.506 H1​: p<0.506   Identify the test statistic for this hypothesis test. The test statistic for this hypothesis test is: ​(Round to two decimal places as​ needed.)   Identify the​ P-value for this hypothesis test. The​ P-value for this hypothesis test is : ​(Round to three decimal places as​ needed.)   Identify the conclusion for this hypothesis test.     A. Fail to reject H0. There is not sufficient evidence to warrant rejection of the claim that 50.6​% of newborn babies are boys.   B.Fail to reject H0. There is sufficient evidence to…

The mean age of bus drivers in chicago is 56.7 years. If a hypothesis test is performed, how should you interpret a decision that rejects the null hypothesis?

The Woodcock-Johnson Cognitive Ability (WJCA) test indicates that the average score is 95. The same group of 12th grade students (n = 72) in Columbus are tested and the sample mean is 110.1 and the sample standard deviation is 15.2.  Do the scores provide good evidence that the mean WJCA score of this population is greater than 95? State the null (H0) and alternative (Ha) hypotheses. 2. What are the confidence intervals for this data? 3. What is the value of the test statistic? 4. What is the p-value for this data? 5. What is your decision about the null hypothesis?: Reject Fail to Reject 6. Summarize the conclusion in the context of the problem.