You are a process engineer for a company that manufactures widgets. A particular machine at your company has some downtime during the day on 30.1% of days. You decided to make some changes to how the machine is calibrated in an attempt to reduce downtime. After monitoring the machine for 315 days after your changes were implemented, you find that the machine had some downtime during the day on 25.1% of days. Conduct a hypothesis test to determine if the proportion of days that the machine has downtime has changed from before, with a= 0.10. Using this information, what is the test statistic in your analysis? Round intermediate calculations to four decimal places, and choose the closest choice to your answer.

Clothes dried outside smell better than those dried in a dryer because of a process called photolysis. Sunlight breaks down compounds that cause odor. A trained smeller is asked to smell a random sample of 20 towels. The smeller does not know it, but all of the 20 towels have been dried in the sun. The smeller is blindfolded and is not allowed to touch the towels but leans forward to smell the towel then rates the towel on a smell-scale of 1 to 10, where 1 is the an extremely unpleasant smell and 10 is a very good smell. A smell rating of 8 is typically attributed to a towel that is dried in the dryer. The mean smell rating for these 20 towels is approximately normal with a mean of 8.45 and the standard deviation is 0.887. A statistician performs a test of Ho μ = 8 versus H₁ μ> 8 where is the true mean smell rating for all towels dried in the sun. This test yields a P-value of 0.0176. What conclusion would you make at the significance level a = 0.05? Because the P-value of 0.0176 < α =…

assume we have a cycle-servixe level of 90%, and we deliver 4 items on a customers order, what is the overall customer service level for the order? (show work)

On an examination given to 8600 students, Hay’s score of 405 was higher than the scores of 3952 of the students who took the examination. What is the percentile for Hya’s score?

Historically, the proportion of students entering a university who finished in 4 years or less was 63%. To test whether this proportion has decreased, 120 students were examined and 52% had finished in 4 years or less. To determine whether the proportion of students who finish in 4 year or less has statistically significantly decreased (at the 5% level of signficance), what is the p-value? (please round your answer to 4 decimal places)

In King County in the first half of 2013 (January to June) there were 3016 HIV-infected residents, 114 of which were diagnosed between January and June of 2013. In that time frame, 220 people died of HIV related causes. The total population of King county in 2013 was 2 million. Use these data to match the terms to the numbers prevalence of HIV infection in King county in the first V Choose 0.006% insufficient information to determine 3016 half of 2013 0.15% incidence of HIV infection i King county in the first half 0.01% 220 of 2013 HIV mortality in this example [Choose] prevalence of HIV infection in King county in 2014 (Choose] HIV mortality rate in this (Choose] example HIV morbidity in this example [Choose] HIV mortality in the US [Choosel

What is the PMT?

A study of 420,002 to cell phone users found that 133 of them develop cancer of the brain and nervous system part of the study of cell phone use the rate of such cancer was found to be .0239% for those not using cell phones. Complete parts (A) and (B).

Suppose you are an epidemiologist who did a survey of 1,150 women who gave birth in Malabon City in 2010, a total of 468 reported taking a multivitamin at least 4 times a week during the month before becoming pregnant. Calculate the prevalence of frequent multivitamin use in this group. Express the rate per 100 population.     Using step-by-step process Topic: Measures of Disease Frequency and Morbidity

Arsenic is a chemical element that occurs in many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. The main use of metallic arsenic is for strengthening alloys of copper and lead. Unfortunately, arsenic occurs in some ground water. In large quantities it is toxic for multicellular life. A mean arsenic level of 8 particles per billion (ppb) is considered safe for agricultural use. A well in Texas is used to water cotton crops. This well is tested regularly for arsenic. A random sample 37 tests gave a sample mean of 7.2 ppb arsenic with standard deviation of 1.9 ppb. Assume that arsenic levels are normally distributed. We are to use the sample data and test if mean arsenic level in the well in question is less than 8 ppb. a. Test statistic isb. The ? − value of the test isc. At the significance level calculated in part c), we conclude that mean arsenic level in thewell is