A professor analyzed the responses of two randomly selected samples of students. The first sample had...
A professor analyzed the responses of two randomly selected samples of students. The first sample had 50 students from a population of Biology freshmen. The second sample had 40 students from a population of Chemistry freshmen. The professor found that 20 of the 50 biology freshmen surveyed had already taken a math course, and 20 of the 40 chemistry freshmen surveyed had already taken a math course. However, the professor believes that the proportion of the population of Biology freshmen who had already taken a math course is the same as the proportion of the population of Chemistry freshmen who had already taken a math course. At the 10% level of significance, test the professor’s belief.
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A professor analyzed the responses of two randomly selected
samples of students. The first sample had...
At a certain university, 15% of students fail general chemistry on their first attempt. Professor Brown...
At a certain university, 15% of students fail general chemistry on their first attempt. Professor Brown teaches at this university and believes that the rate of first-time failure in his general chemistry classes is 24%. He samples 75 students from last semester who were first-time enrollees in general chemistry and finds that 11 of them failed his course. i). Sate the appropriate null and alternate hypotheses. ii). Compute the test statistic z. ii). Using a 0.05, can you conclude that...
Consider the following results for two samples randomly taken from two populations. Sample A Sample B...
Consider the following results for two samples randomly taken from two populations. Sample A Sample B Sample Size 16 10 Sample Mean 28,000 24,000 Sample Standard Deviation 2,100 2,800 tion Determine the pooled estimate of the population variance. Select one: O A. 5,696,250.0 O B. 5,326,250.0 O C.625.0 O D. None of the above answers is correct Two brand managers were in disagreement over the issue of whether urban homemakers had greater variability in grocery shopping pattern than did rural...
A professor finds that for 16 randomly selected students the time needed to complete an assignment...
A professor finds that for 16 randomly selected students the time needed to complete an assignment had a sample mean of 66 minutes and a sample standard deviation of 40 minutes. If the time needed to complete the assignment is normally distributed, then the standard error of the mean is a. 5 b. 20 c. 16 d. 10
A lecturer believes that less than 40% of all students understand hypothesis testing. To determine whether...
A lecturer believes that less than 40% of all students understand hypothesis testing. To determine whether or not there is strong evidence to support his belief he tests a random sample of 50 students which shows the proportion of students who understand hypothesis testing to be 28%. The lecturer would A.not reject Ho at 5% but reject Ho at 1% level of significance B.reject Ho at 5% but not reject Ho at 1% level of significance C.reject Ho at both...
Confidence Intervals: A group of 50 randomly selected JWU students have a mean age of 20.5...
Confidence Intervals: A group of 50 randomly selected JWU students have a mean age of 20.5 years. Assume the population standard deviation is 1.5 years. Construct a 99% confidence interval for the JWU population mean age. State your answer. (Zc 2.57) 1. 2. Construct a 90% confidence interval for the population mean, . Assume the population has a 2 normal distribution. A random sample of 20 JWU college students has mean annual earnings of 0 $3310 with a standard deviation...
Independent random samples of students were taken from two high schools, R and S, and the...
Independent random samples of students were taken from two high schools, R and S, and the proportion of students who drive to school in each sample was recorded. The difference between the two sample proportions (R minus S) was 0.07. Under the assumption that all conditions for inference were met, a hypothesis test was conducted where the alternative hypothesis was the population proportion of students who drive to school for R was greater than that for S. The p-value of...
1. A mathematics professor believes that the performance of students taking an elementary calculus course has declined in recent years. The professor decides to reuse a final exam that was first admin...
1. A mathematics professor believes that the performance of students taking an elementary calculus course has declined in recent years. The professor decides to reuse a final exam that was first administered 10 years ago. At that time the mean score was 81 with s=10, for the 50 students in the section taught by that professor When given to the current class of 53 students, who observed essentially the same set of lectures, the mean is 75 with s=15. If...
1. Independent random samples of students were taken from two high schools, R and S, and...
1. Independent random samples of students were taken from two high schools, R and S, and the proportion of students who drive to school in each sample was recorded. The difference between the two sample proportions (R minus S) was 0.07. Under the assumption that all conditions for inference were met, a hypothesis test was conducted where the alternative hypothesis was the population proportion of students who drive to school for R was greater than that for S. The p-value...
The average score for the statistics course is 39%. A professor wants to see if the...
The average score for the statistics course is 39%. A professor wants to see if the average score for students who are given colored pens on the first day of class is larger. The scores for the 16 randomly selected students who were given the colored pens are shown below. Assume that the distribution of the population is normal. 44, 34, 32, 48, 42, 33, 40, 41, 50, 36, 50, 51, 43, 48, 47, 45 Copy to clipboard What can...
11.A college professor wants to report and estimate the mean weekly salaries of his part-time working students. A sample of 7 students who work part-time showed the following weekly wages: $107 $192 $...
11.A college professor wants to report and estimate the mean weekly salaries of his part-time working students. A sample of 7 students who work part-time showed the following weekly wages: $107 $192 $97 $295 $105 $151 $91 Construct a confidence interval for the population mean with a 90% confidence level? A. [79.77, 216.80] B. (93.87, 202.70 C. [143.93, 152.64] D. 199.43, 105.68] 12. You want to open a NACHO BIZNESS Mobile Food TruckNOVA. A study would be needed to estimate...
At a certain university, 15% of students fail general chemistry on their first attempt. Professor Brown teaches at this university and believes that the rate of first-time failure in his general chemistry classes is 24%. He samples 75 students from last semester who were first-time enrollees in general chemistry and finds that 11 of them failed his course. i). Sate the appropriate null and alternate hypotheses. ii). Compute the test statistic z. ii). Using a 0.05, can you conclude that...
Consider the following results for two samples randomly taken from two populations. Sample A Sample B Sample Size 16 10 Sample Mean 28,000 24,000 Sample Standard Deviation 2,100 2,800 tion Determine the pooled estimate of the population variance. Select one: O A. 5,696,250.0 O B. 5,326,250.0 O C.625.0 O D. None of the above answers is correct Two brand managers were in disagreement over the issue of whether urban homemakers had greater variability in grocery shopping pattern than did rural...
Confidence Intervals: A group of 50 randomly selected JWU students have a mean age of 20.5 years. Assume the population standard deviation is 1.5 years. Construct a 99% confidence interval for the JWU population mean age. State your answer. (Zc 2.57) 1. 2. Construct a 90% confidence interval for the population mean, . Assume the population has a 2 normal distribution. A random sample of 20 JWU college students has mean annual earnings of 0 $3310 with a standard deviation...
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