A questionaire ask the respondents to write their responses in about 100 words. To test if...
A questionaire ask the respondents to write their responses in about 100 words. To test if the mean number of words in the responses is 100 words or it is different from 100 words a simple random sample of 12 responses will be taken. State the null hypothesis and the alternative hypothesis.
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A questionaire ask the respondents to write their responses in
about 100 words. To test if...
A researcher in interested in whether students who are musicians have higher intelligence test sc...
A researcher in interested in whether students who are musicians have higher intelligence test scores than students in the general population. The mean for the general population is 100. The researcher selects musicians from local high schools and gives them an intelligence test, with a mean of 105. SS 725 for the 2. 30 sample Null Hypothesis (Ho): μ State in words: Alternative Hypothesis (Ha): μ > State in words: df= t critical value (with α : .05): One-tailed or...
A simple random sample of 2020 pages from a dictionary is obtained. The numbers of words...
A simple random sample of 2020 pages from a dictionary is obtained. The numbers of words defined on those pages are found, with the results nequals=2020 , x overbarxequals=55.255.2 words, sequals=16.516.5 words. Given that this dictionary has 14341434 pages with defined words, the claim that there are more than 70,000 defined words is equivalent to the claim that the mean number of words per page is greater than 48.848.8 words. Use a 0.010.01 significance level to test the claim that...
Assume that a simple random sample has been selected from a normally distributed population and test the given claim. Id...
Assume that a simple random sample has been selected from a normally distributed population and test the given claim. Identify the null and alternative hypotheses, test statistic, critical value(s), and state the final conclusion that addresses the original claim. A simple random sample of pages from a dictionary is obtained. Listed below are the numbers of words defined on those pages. Given that this dictionary has 1459 pages with defined words, the claim that there are more than 70,000 defined...
Assume that a simple random sample has been selected from a normally distributed population and test...
Assume that a simple random sample has been selected from a normally distributed population and test the given claim. Identify the null and alternative hypotheses, test statistic, P-value, and state the final conclusion that addresses the original claim. A simple random sample of 2525 filtered 100 mm cigarettes is obtained, and the tar content of each cigarette is measured. The sample has a mean of 19.219.2 mg and a standard deviation of 3.353.35 mg. Use a 0.050.05 significance level to...
Scientists would like to test if there is a difference between the mean amount of nicotine...
Scientists would like to test if there is a difference between the mean amount of nicotine in menthol cigarettes and the mean amount of nicotine in non-menthol cigarettes. The scientists collect a simple random sample of 25 menthol cigarettes and 25 non-menthol cigarettes. Both samples consist of cigarettes that are filtered, 100 mm long, and non-light. The menthol cigarettes have a mean nicotine amount of 0.87 mg and a standard deviation of 0.24 mg. The non-menthol cigarettes have a mean...
1. The mean number of days it takes an employer to approve medical leave is believed to be about ten. Members of a...
1. The mean number of days it takes an employer to approve medical leave is believed to be about ten. Members of a collective bargaining unit do not believe this figure. They randomly survey eight employees. The number of days they took to approve medical leave are as follows: 12; 4; 15; 3; 11; 8; 6; 8. Let X = the number of days the employer took to approve medical leave. (a) Identify a null and alternative hypothesis. (b) Determine...
A simple random sample of size n=40 is drawn from a population. The sample mean is...
A simple random sample of size n=40 is drawn from a population. The sample mean is found to be 106.9,and the sample standard deviation is found to be 15.1. Is the population mean greater than 100 at the α=0.025 level of significance? A) Determine the null and alternative hypotheses. B) Compute the test statistic C) Determine the P-value. (Round to three decimal places as needed.) D) What is the result of the hypothesis test? ____ the null hypothesis because the...
Garrison Keller claims the children of Lake Wobegon are above average. You take a simple random...
Garrison Keller claims the children of Lake Wobegon are above average. You take a simple random sample of 9 children from Lake Wobegon and measure their intelligence with a Wechsler test and find the following scores: {116, 128, 125, 119, 89, 99, 105, 116, and 118}. The mean of this sample (? ̅) is 112.8. We know Wechsler scores are scaled to be normally distributed with a mean of 100 and standard deviation of 15. Is this sample mean sufficiently...
A simple random sample of 20 pages from a dictionary is obtained. The numbers of words...
A simple random sample of 20 pages from a dictionary is obtained. The numbers of words defined on those pages are found, with the results n=20, x = 55.2 words, s = 15.6 words. Given that this dictionary has 1449 pages with defined words, the claim that there are more than 70,000 defined words is equivalent to the claim that the mean number of words per page is greater than 48.3 words. Use a 0.01 significance level to test the...
In a clinical study of an allergy drug, 108 of the 203 subjects reported experiencing significant...
In a clinical study of an allergy drug, 108 of the 203 subjects reported experiencing significant relief from their symptoms. Using a significance level of 0.01, test the claim that more than half of all those using the drug experienced relief. State the null hypothesis H0. State the alternative hypothesis H1. What is the test statistic? State the alpha level. Determine p value. Do you or do you not reject the null hypothesis? Why? Write a clear conclusion using a...
A researcher in interested in whether students who are musicians have higher intelligence test scores than students in the general population. The mean for the general population is 100. The researcher selects musicians from local high schools and gives them an intelligence test, with a mean of 105. SS 725 for the 2. 30 sample Null Hypothesis (Ho): μ State in words: Alternative Hypothesis (Ha): μ > State in words: df= t critical value (with α : .05): One-tailed or...
Scientists would like to test if there is a difference between the mean amount of nicotine in menthol cigarettes and the mean amount of nicotine in non-menthol cigarettes. The scientists collect a simple random sample of 25 menthol cigarettes and 25 non-menthol cigarettes. Both samples consist of cigarettes that are filtered, 100 mm long, and non-light. The menthol cigarettes have a mean nicotine amount of 0.87 mg and a standard deviation of 0.24 mg. The non-menthol cigarettes have a mean...
1. The mean number of days it takes an employer to approve medical leave is believed to be about ten. Members of a collective bargaining unit do not believe this figure. They randomly survey eight employees. The number of days they took to approve medical leave are as follows: 12; 4; 15; 3; 11; 8; 6; 8. Let X = the number of days the employer took to approve medical leave. (a) Identify a null and alternative hypothesis. (b) Determine...
A simple random sample of 20 pages from a dictionary is obtained. The numbers of words defined on those pages are found, with the results n=20, x = 55.2 words, s = 15.6 words. Given that this dictionary has 1449 pages with defined words, the claim that there are more than 70,000 defined words is equivalent to the claim that the mean number of words per page is greater than 48.3 words. Use a 0.01 significance level to test the...
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