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A random sample of 36 students at a community college showed an average age of 25...
A random sample of 31 students at a community college showed an average age of 25...
A random sample of 31 students at a community college showed an average age of 25 years. Assume the ages of all students at the college are normally distributed with a standard deviation of 1.8 years The 98% confidence interval for the average age of all students at this college is (Round your answers to 3 decimal places.) 1 Point Answer From 24.248 To 25.752
A sporting goods store believes the average age of its customers is 34 or less, but...
A sporting goods store believes the average age of its customers is 34 or less, but a competitor wants to challenge this. A random sample of 38 customers was surveyed, and the average customer age was found to be 37.5 years. Assume the standard deviation for customer age is 7.0 years. Using a = 0.05, complete parts a through d below a. Does the sample provide enough evidence to refute the age claim made by the sporting goods store? Determine...
A presidential candidate's alde estimates that, among all college students, the proportion p who intend to...
A presidential candidate's alde estimates that, among all college students, the proportion p who intend to vote in the upcoming election is at most 65%. If 188 out of a random sample of 260 college students expressed an intent to vote, can the aide's estimate be rejected at the 0.05 level of significance? Perform a one-tailed test. Then fill in the table below. Carry your intermediate computations to at least three decimal places and round your answers as specified in...
An education researcher claims that 54% of college students work year-round. In a random sample of...
An education researcher claims that 54% of college students work year-round. In a random sample of 200 college students, 108 say they work year-round. At a = 0.01, is there enough evidence to reject the researcher's claim? Complete parts (a) through (e) below. (a) Identify the claim and state Ho and Ha Identify the claim in this scenario. Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or a decimal. Do...
(6 points) Cars on Campus. Statistics students at a community college wonder whether the cars belonging to students are...
(6 points) Cars on Campus. Statistics students at a community college wonder whether the cars belonging to students are, on average, older than the cars belonging to faculty. They select a random sample of 23 cars in the student parking lot and find the average age to be 8.5 year with a standard deviation of 5.3 year. A random sample of 23 cars in the faculty parking lot have an average age of 3.4 years with a standard deviation of...
11. A random sample of 25 statistics examinations was taken. The average score in the sample...
11. A random sample of 25 statistics examinations was taken. The average score in the sample was 76 with a variance of 144. Assuming the scores are normally distributed, the 99% confidence interval for the population average examination score is 70.02 to 81.98 6. 69.82 to 82.18 70.06 to 81.94 d. 69.48 to 82.52 2. c. 12. It is known that the population variance equals 484. With a 0.95 probability, the sample size that needs to be taken to estimate...
The college bookstore tells prospective students that the average cost of its textbooks is $102. A...
The college bookstore tells prospective students that the average cost of its textbooks is $102. A random sample of 81 textbooks found the mean price to be $105.80, with a sample standard deviation of $22.50. Assuming the distribution of textbook prices is normally distributed, does this sample indicate that the average cost of textbooks is actually greater than $1027 Use a 5 level of significance for your test. a.) What is a State the null and alternate hypotheses. Will you...
26. In a random sample of 95 college students, 40 wished they would have chosen a...
26. In a random sample of 95 college students, 40 wished they would have chosen a different major. Use the following steps to construct a 95% confidence interval for the true proportion of all students who wished they would have chosen a different major. a. Find the number of sample values, n b. Find the sample proportion, B c. Find the critical z-score, 2/2 d. When calculated correctly, E = 0.0993. Construct a confidence interval for the population proportion, p....
random sample of 28 students at the university showed an average age of 25 years and...
random sample of 28 students at the university showed an average age of 25 years and a sample standard deviation of 2 years. Calculate the margin of error for a confidence interval for age at the 98% level of confidence O 1.235 O : 1.645 ○ :0.945 O 0.888
A sample of 50 third-grade students had a average of 78 on a math proficiency test,...
A sample of 50 third-grade students had a average of 78 on a math proficiency test, with a sample standard deviation of 12. Is there enough evidence to conclude that the third-grade sample mean is different from the third-grade population mean of 67? Assume a 0.02 significance level. Use the Critical Value Method of Testing (this means NO P-Values!). In your work space below, you will need to have - 1. The null hypothesis, Ho 2. The alternative hypothesis, H1...
A random sample of 31 students at a community college showed an average age of 25 years. Assume the ages of all students at the college are normally distributed with a standard deviation of 1.8 years The 98% confidence interval for the average age of all students at this college is (Round your answers to 3 decimal places.) 1 Point Answer From 24.248 To 25.752
A sporting goods store believes the average age of its customers is 34 or less, but a competitor wants to challenge this. A random sample of 38 customers was surveyed, and the average customer age was found to be 37.5 years. Assume the standard deviation for customer age is 7.0 years. Using a = 0.05, complete parts a through d below a. Does the sample provide enough evidence to refute the age claim made by the sporting goods store? Determine...
A presidential candidate's alde estimates that, among all college students, the proportion p who intend to vote in the upcoming election is at most 65%. If 188 out of a random sample of 260 college students expressed an intent to vote, can the aide's estimate be rejected at the 0.05 level of significance? Perform a one-tailed test. Then fill in the table below. Carry your intermediate computations to at least three decimal places and round your answers as specified in...
An education researcher claims that 54% of college students work year-round. In a random sample of 200 college students, 108 say they work year-round. At a = 0.01, is there enough evidence to reject the researcher's claim? Complete parts (a) through (e) below. (a) Identify the claim and state Ho and Ha Identify the claim in this scenario. Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or a decimal. Do...
(6 points) Cars on Campus. Statistics students at a community college wonder whether the cars belonging to students are, on average, older than the cars belonging to faculty. They select a random sample of 23 cars in the student parking lot and find the average age to be 8.5 year with a standard deviation of 5.3 year. A random sample of 23 cars in the faculty parking lot have an average age of 3.4 years with a standard deviation of...
11. A random sample of 25 statistics examinations was taken. The average score in the sample was 76 with a variance of 144. Assuming the scores are normally distributed, the 99% confidence interval for the population average examination score is 70.02 to 81.98 6. 69.82 to 82.18 70.06 to 81.94 d. 69.48 to 82.52 2. c. 12. It is known that the population variance equals 484. With a 0.95 probability, the sample size that needs to be taken to estimate...
The college bookstore tells prospective students that the average cost of its textbooks is $102. A random sample of 81 textbooks found the mean price to be $105.80, with a sample standard deviation of $22.50. Assuming the distribution of textbook prices is normally distributed, does this sample indicate that the average cost of textbooks is actually greater than $1027 Use a 5 level of significance for your test. a.) What is a State the null and alternate hypotheses. Will you...
26. In a random sample of 95 college students, 40 wished they would have chosen a different major. Use the following steps to construct a 95% confidence interval for the true proportion of all students who wished they would have chosen a different major. a. Find the number of sample values, n b. Find the sample proportion, B c. Find the critical z-score, 2/2 d. When calculated correctly, E = 0.0993. Construct a confidence interval for the population proportion, p....
random sample of 28 students at the university showed an average age of 25 years and a sample standard deviation of 2 years. Calculate the margin of error for a confidence interval for age at the 98% level of confidence O 1.235 O : 1.645 ○ :0.945 O 0.888
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