If you use a 0.05 level of significance in a two-tail hypothesis test, what decision will you make if ZSTAT = +1.2
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If you use a 0.05 level of significance in a two-tail hypothesis test, what decision will you make if ZSTAT = +1.2
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- A publisher reports that 46% of their readers own a Jaguar. A marketing executive wants to test the claim that the percentage is actually more than the reported percentage. A random sample of 220 readers found that 50% of the readers owned a Jaguar. Is there sufficient evidence at the 0.05 level of significance to support the executive’s claim? H0: p = 0.46 Ha: p >> 0.46 Is this a one-tailed or a two-tailed test? Explain your reasoning.It has been found that many first-time interviewees commit errors that could very well affect the outcome of the interview. An astounding 77% are guilty of using their cell phones or texting during the interview. A researcher suspects that the proportion of female offenders is less than the proportion of male offenders. Out of 150 females, 80 used their cell phone and 72 of 120 males did so. At the 0.01 level of significance, is there enough evidence to support the researcher's claim?If, in a (two-tail) hypothesis test, the p-value is 0.0921, what is your statistical decision if you test the null hypothesis at the 0.06 level of significance?
- A study was conducted simultaneously in two different communities in New York City to examine an association between variable A and variable B. The resulting analysis yielded two different p-value in the two communities? Study in Community A yielded a p-value of 0.01.Study in Community B yielded a p-value of 0.05. Which of the above values provides a stronger indictment of the null hypothesis? A. 0.01B. 0.05#1 According to research, foot length of women is normally distributed with mean 9.58 inches and standard deviation 0.51 inch. The distríbution is useful to shoe manufacturers, shoe stores, and related merchants because it permits them to make informed decisions about she production, inventory and so forth. a) Sketch a Normal curve and place on it the values that correspond to 21, 12, ±3 standard deviations of the mean, as well as the mean itself. Women's Size Conversions b) What percentage of women have foot lengths between 9.5 and 10 inches? Show all your computations and shade the area under the Normal curve. Explain how US Sizes Euro Sizes UK Sizes inches CM 2.1875" 20.8 35 2 4.5 35 2.5 2.375" 21.3 you obtained your answer. 8.5 3 35-36 21.6 5.5 36 3.5 a.75 22.2 6 36-37 8.375" 22.5 4 6.5 45 9.0625" 23 37 7 37-38 5 9.25" 23.5 7.5 38 5.5 9.375" 23.8 c) What percentage of women have foot lengths below 9 inches? Show all your computations and shade the area 8.5 under the Normal curve.…Under what research situation would a researcher use a one-tailed test rather than a two-tailed test?
- In a neuroscience research lab, the researchers want to know the effects of long-term marijuana use on memory and reaction times. In order to investigate their research hypothesis a sample of 50 long-term marijuana users between the ages of 35-45 were selected with a mean memory and reaction time of 69.4 seconds. The population average for the same age group has a mean of 48 and S.E.M. is 7. Go through the steps of hypothesis testing, select appropriate statistics and state your results, use a=.05.If you use a 0.05 level of significance in a two tail hypothesis test, what decision will you make if z = +2.21?Spam: A researcher reported that 71.8% of all email sent in a recent month was spam. A system manager at a large corporation believes that the percentage at his company may be 78%. He examines a random sample of 500 emails received at an email server, and finds that 369 of the messages are spam. Can you conclude that less than 78% of emails are spam? Use both a = 0.10 and a = 0.01 levels of significance and the critical value method with the table. Part 1 of 5 State the appropriate null and alternate hypotheses. Ho: p = 0.78 H: p < 0.78 This hypothesis test is a left-tailed v test. Part: 1/5 Part 2 of 5 Find the critical values. Round the answers to three decimal places. For a = 0.10, the critical value is For a = 0.01, the critical value is
- USA Today reported that about 47% of the general consumer population in the United States is loyal to the automobile manufacturer of their choice. Suppose Chevrolet did a study of a random sample of 1008 Chevrolet owners and found that 481 said they would buy another Chevrolet. Does this indicate that the population proportion of consumers loyal to Chevrolet is more than 47%? Use ? = 0.01. (a) What is the level of significance?State the null and alternate hypotheses. H0: p = 0.47; H1: p > 0.47H0: p = 0.47; H1: p < 0.47 H0: p > 0.47; H1: p = 0.47H0: p = 0.47; H1: p ≠ 0.47 (b) What sampling distribution will you use? The standard normal, since np > 5 and nq > 5.The standard normal, since np < 5 and nq < 5. The Student's t, since np > 5 and nq > 5.The Student's t, since np < 5 and nq < 5. What is the value of the sample test statistic? (Round your answer to two decimal places.)(c) Find the P-value of the test statistic. (Round your answer to four…Please help me better understand how to properly solve. A randomized controlled experiment in Charlotte, North Carolina, studied three police responses to spousal abuse: advise and possibly separate the couple, issue a citation to the offender, and arrest the offender. The effectiveness of the three responses was determined by re-arrest rates. The photo shows the rates. Research wishes to test null hypothesis that that the proportions of subsequent arrests are the same regardless of the treatment assigned. Under the null hypothesis, determine the expected number of times no subsequent arrest would occur for the treatment “Advise/separate”?Suppose a hypothesis test was 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 rejecting the null hypothesis in error. True False
