The average time it takes to complete a particular sociology test is 86.5 minutes. In a...

The average time it takes to complete a particular sociology test is 86.5 minutes. In a recent study of 26 individuals that took it a particular test the average amount of time to complete the sociology test was 83.4 minutes. The sample standard deviation was 8.7 minutes. At the 0.10 level of significance can it be concluded that the average amount of time it takes to complete the particular sociology test is less than 86.5 minutes.

Solutions

Expert Solution

orchestra answered 1 year ago

Next > < Previous

Related Solutions

The average time students need to finish a particular test is 72 minutes with a standard...

The average time students need to finish a particular test is 72 minutes with a standard deviation of 12 minutes. (Assume that these times are normally distributed.) What is the probability that a randomly selected student will finish the exam in more than 75 minutes? If the professor wants 95% of students to have sufficient time to finish the test, how much time should she give them? What is the probability that a group of 20 students will take on...

Suppose the average time to complete a marathon is believed to be 264 minutes. If a...

Suppose the average time to complete a marathon is believed to be 264 minutes. If a random sample of 67 marathon runners posted an average time of 248 minutes, with a standard deviation of 46.6 minutes, is there evidence to support the claim that the average time is lower than originally thought? Perform a hypothesis test with significance level 0.01. A. State the null hypothesis in symbols and in a complete sentence. B. State the alternative hypothesis in symbols and...

A car manufacturer has determined it takes an average time of 54 minutes to produce a...

A car manufacturer has determined it takes an average time of 54 minutes to produce a car. The population standard deviation is assumed to be 4 minutes. The company pays a bonus to the workers for every car produced in 46 minutes or less. Assuming that the production time is normally distributed, answer the following questions. Let X = production time of a randomly selected car. Round all probabilities to four decimal places and times to two decimal places. a)...

A car manufacturer has determined it takes an average time of 54 minutes to produce a...

A car manufacturer has determined it takes an average time of 54 minutes to produce a car. The population standard deviation is assumed to be 4 minutes. The company pays a bonus to the workers for every car produced in 46 minutes or less. Assuming that the production time is normally distributed, answer the following questions. Let X = production time of a randomly selected car. (Round all probabilities to four decimals and times to two decimals) a) What is...

9. You are interested in studying the average duration of time (in minutes) it takes Temple...

9. You are interested in studying the average duration of time (in minutes) it takes Temple University students to drive to campus. The conventional wisdom is that on average it takes students 30 minutes to drive to campus. To examine this, you randomly sample n=15 students and record this information. From the sample, you compute a sample mean of 26 with a sample standard deviation of 6. Conduct a two-tailed hypothesis test with 95% confidence. Then, construct a 95% confidence...

An automobile dealer conducted a test to determine if the time in minutes needed to complete...

An automobile dealer conducted a test to determine if the time in minutes needed to complete a minor engine tune-up depends on whether a computerized engine analyzer or an electronic analyzer is used. Because tune-up time varies among compact, intermediate, and full-sized cars, the three types of cars were used as blocks in the experiment. The data obtained follow. Analyzer Computerized Electronic Car Compact 50 41 Intermediate 55 44 Full-sized 63 47 Use α = 0.05 to test for any...

An automobile dealer conducted a test to determine if the time in minutes needed to complete...

An automobile dealer conducted a test to determine if the time in minutes needed to complete a minor engine tune-up depends on whether a computerized engine analyzer or an electronic analyzer is used. Because tune-up time varies among compact, intermediate, and full-sized cars, the three types of cars were used as blocks in the experiment. The data obtained follow. Analyzer Computerized Electronic Car Compact 49 41 Intermediate 56 45 Full-sized 63 46 Use α = 0.05 to test for any...

An automobile dealer conducted a test to determine if the time in minutes needed to complete...

An automobile dealer conducted a test to determine if the time in minutes needed to complete a minor engine tune-up depends on whether a computerized engine analyzer or an electronic analyzer is used. Because tune-up time varies among compact, intermediate, and full-sized cars, the three types of cars were used as blocks in the experiment. The data obtained follow. Analyzer Computerized Electronic Car Compact 52 43 Intermediate 55 43 Full-sized 61 46 Use α = 0.05 to test for any...

An automobile dealer conducted a test to determine if the time in minutes needed to complete...

An automobile dealer conducted a test to determine if the time in minutes needed to complete a minor engine tune-up depends on whether a computerized engine analyzer or an electronic analyzer is used. Because tune-up time varies among compact, intermediate, and full-sized cars, the three types of cars were used as blocks in the experiment. The data obtained follow. Analyzer Computerized Electronic Car Compact 50 42 Intermediate 57 45 Full-sized 61 45 Use α = 0.05 to test for any...

If the average time to finish an IQ test is 85 minutes with standard deviation of...

If the average time to finish an IQ test is 85 minutes with standard deviation of 17 minutes and assuming the data are normally distributed, 1. what percentage of test takers finish less than 117 minutes? 2. what percentage of test takers finishes between one hour to hour and half? 3. find the time that separates the slowest 15% who finish the test? 4. find the time that separates the fastest 5% who finish the test?

Subjects