Prof Rea’s Exam Q2 A study found that the mean height of adult American women is 64.5 inches with a standard deviation of 2.5 inches and that the mean height of adult American men is 70 inches with a standard deviation of 3 inches. Suppose we are interested in finding the differences in means from independent random samples of adult American women and men. Research has shown that the distributions of adult height is normal. We randomly survey 25 adult American women and 22 adult American men.  a. Let

Upon treatment with heat or chemicals, bacteria will _______________________.

1. This assessment is enabling you to demonstrate your understanding of the concepts presented in unit 7, and section 8.1. Use techniques you have learned to solve the problems on the assessment. Points will be earned primarily through the process of solving. Therefore, you will show as much work as possible and will provide justification whenever necessary. Write your favorite color on the bottom of the first page for an extra point. Use models, tables, and/or write descriptively when providing explanations.  The solutions you provide should be of your own original thought. No collaboration/discussion with anyone is permitted or use of any computer system or server, is allowed. desmos graphing and scientific calculators are permitted on this assessment, but you will be required to show how you reached your answers (especially if the directions say “show the calculation to earn credit”). Please indicate which function in desmos you used to find probabilities and/or critical values and/or sample means/standard deviations. If I suspect any part of the work is not your own, you will earn a zero on  the assessment and the activity will be reported to the college to be formally processed and permanently recorded.  Sign your name on your work and answer template to acknowledge and agree to these terms. 

Prof Rea’s Exam Q7 Given below is a clickable scatterplot generated from data taken from 24 parents. What is the direction of the relationship?  

Exam Question 3 The systolic blood pressure (given in mm Hg) of males has an approximately normal distribution with mean µ = 125 and standard deviation σ = 13. Label the tick marks on the horizontal axis using what you know about the normal distribution and noting that the distance between each tick mark is 1 standard deviation. Adam says that . Describe three mistakes that Adam made. Then explain to him how to fix them. Identify the systolic BPs that encompass approximately 95% of all systolic BP’s of males. Explain why.

Prof Rea’s Exam Question 2. A restaurant is deciding which farm to order berries from for a seasonal dessert on their menu. The average cost for a pound of berries in California is $2.82 with a population standard deviation of $0.45. Assume that berry cost in California is normally distributed. Suppose that farms in California sell 10 different kinds of berries.  Explain why the sampling distribution of sample means is approximately normal.  Compute the mean,

Exam Question 3 The systolic blood pressure (given in mm Hg) of males has an approximately normal distribution with mean µ = 125 and standard deviation σ = 13. Label the tick marks on the horizontal axis using what you know about the normal distribution and noting that the distance between each tick mark is 1 standard deviation. Adam says that . Describe three mistakes that Adam made. Then explain to him how to fix them. Identify the systolic BPs that encompass approximately 95% of all systolic BP’s of males. Explain why.

Prof Rea’s Exam Question 2. A restaurant is deciding which farm to order lettuce from for a seasonal salad on their menu. The average cost for an assortment of 5 heads of lettuce in California is $7.69 with a population standard deviation of $0.18. Assume that lettuce cost in California is normally distributed. Suppose that farms in California sell 10 different kinds of lettuce. Explain why the sampling distribution of sample means is approximately normal.  Compute the mean,

Prof Rea’s Exam Question 4. Show as much work as possible and clearly show all four steps of a hypothesis test to earn credit: Last year, researchers determined that the average cost for health insurance for an individual in the US was $605 per month. You wonder if the average monthly cost for health insurance has decreased since last year. You randomly survey 125 adults in the US and find that they spend an average of $585 per month on health insurance. You compute the sample standard deviation to be $82. Test your claim using a 5% level of significance. Round all calculated values to three decimal places.

Exam Question 10 Let  represent the Covid vaccination rate in Rancho Cucamonga. The null and alternative hypotheses are , . Given this information, write the claim being tested. Sandy tests the claim and finds the P-value to be 0.03. Write the conclusion in plain language if the level of significance is 1%.