Week 7 Assignment Hypothesis Test for the Mean-Populations Standard Deviation Known Question Jamie, a bowler, claims that her bowling score is less than 168 points, on average. Several of her teammates do not believe her, so she decides to do a hypothesis test, at a 1% significance level, to persuade them. She bowls 17 games. The mean score of the sample games is 155 points. Jamie knows from experience that the standard deviation for her bowling score is 19 points. H0: μ≥168; Ha: μ&lt...

Week 7 Assignment Developing Hypothesis and Understanding Possible Conclusions for Proportions Question A college professor claims that the proportion of students passing a statistics course is 80%. To test this claim, a random sample of 250 students who previously took the course is taken and it is determined that 221 students passed the course. The following is the setup for this hypothesis test: H0:p = 0.80 Ha:p ≠ 0.80 Find the test statistic for this hypothesis test for a p...

Week 7 Assignment Conduct a Hypothesis for Proportion-P-Value Approach Question A teacher claims that the proportion of students expected to pass an exam is greater than 80%. To test this claim, the teacher administers the test to 200 random students and determines that 151 students pass the exam. The following is the setup for this hypothesis test: H0:p=0.80 Ha:p>0.80 In this example, the p-value was determined to be 0.944. Come to a conclusion and interpret the results ...

Week 7 Discussion: Hypothesis Testing Required Resources Read/review the following resources for this activity: Textbook: Chapter 9 Lesson Minimum of 1 scholarly source In your reference for this assignment, be sure to include both your text/class materials AND your outside reading(s). Initial Post Instructions Describe a hypothesis test study that would help your work or conclusions in some way. Describe what variable would be tested and what would be you...

Week 6 Quiz QUESTION 1 1/1 POINTS A statistics professor recently graded final exams for students in her introductory statistics course. In a review of her grading, she found the mean score out of 100 points was a x¯=77, with a margin of error of 10. Construct a confidence interval for the mean score (out of 100 points) on the final exam. QUESTION 2 1/1 POINTS A random sample of adults were asked whether they prefer reading an e-book over a printed book. The survey resul...

Week 6 Assignment Confidence Interval for Mean Question Suppose scores of a standardized test are normally distributed and have a known population standard deviation of 11 points and an unknown population mean. A random sample of 15 scores is taken and gives a sample mean of 101 points. Find the confidence interval for the population mean with a 98% confidence level. You may use a calculator or the common z values above. Round the final answer to two decimal places Provide your an...

Week 6 Assignment  Confidence Intervals Question The average number of onions needed to make French onion soup from a population of recipes is unknown. A random sample of recipes yields a sample mean of x¯=8.2 onions. Assume the sampling distribution of the mean has a standard deviation of σx¯=2.3 onions. Use the Empirical Rule to construct a 95% confidence interval for the true population mean number of onions. Provide your answer below: Question In a random sample of 30 young...

Week 6 Assignment Points Estimates of Error, and Confidence Intervals Question             Randomly sampled employees at an office were asked to take part in a survey about overtime. The office manager wanted to find out how many employees worked overtime in the last week. The proportion of employees that worked overtime was 0.83, with a margin of error of 0.11. Construct a confidence interval for the proportion of employees that worked overtime in the last week. Question A produ...

Week 6 Assignment Estimating Size for a Population Proportion Question Suppose an automotive repair company wants to determine the current percentage of customers who keep up with regular vehicle maintenance. How many customers should the company survey in order to be 90% confident that the estimated (sample) proportion is within 2 percentage points of the true population proportion of customers who keep up with regular vehicle maintenance? Question Suppose a clothing store wants to...

Week 6 Assignment Understanding Confidence Intervals Question A company wants to determine a confidence interval for the average CPU time of its teleprocessing transactions. A sample of 70 random transactions in milliseconds is given below. Assume that the transaction times follow a normal distribution with a standard deviation of 600 milliseconds. Use Excel to determine a 98% confidence interval for the average CPU time in milliseconds. Round your answers to the nearest integer and use as...