a) An appliance company advertises that its brand of washing machine will last a lifetime. Well, not really a lifetime, but longer than 10 years. A random sample of 50 machines manufactured in the past 20 years is selected to test this claim at a significance level of .1. If the sample mean is 11 years and the sample standard deviation is 4. Conduct the test of hypothesis.

b) A school states that over 85% of its graduates find employment within the first year after graduating. A recent sample of 400 graduates was selected at random and asked the question, “Did you find employment within the first year after graduating?” and 348 of those responded “Yes”. Test the schools claim at α = .05.

In an attempt to prevent polio, Jonas Salk of the University of Pittsburgh developed a polio vaccine. In a test of its efficacy, a study was carried out in which nearly 2 million grade-school children were enrolled; half were given the vaccine, the other half received a placebo (in this case, an injection of salt water). Neither the children nor the doctors performing the diagnoses knew which children belong to which group. The incidence of polio was far lower in the group that received the Salk vaccine.

(a) (3 points) Is this statistical study an observational study or is it a randomized experiment? Explain
your answer.
(b) (2 points) Is it appropriate to conclude that the vaccine lowers the risk a child will develop polio? Why
or why not?

. (Education) A researcher would like to know whether there is a consistent, predictable relationship between verbal skills and math skills for high school students. A sample of 300 students is obtained and each student is given a standardized English test and a standardized math test. Based on the test results, students are classified as high, medium, or low for verbal skills and for math skills. The results are summarized in the following frequency distribution:

verbal skills

Math skills

Based on these results, can the researcher conclude that there is a significant relationship between verbal skills and math skills at the 10% level of significance?

A college entrance exam company determined that a score of 22 on the mathematics portion of the exam suggests that a student is ready for​ college-level mathematics. To achieve this​ goal, the company recommends that students take a core curriculum of math courses in high school. Suppose a random sample of 250 students who completed this core set of courses results in a mean math score of 22.5 on the college entrance exam with a standard deviation of 3.9.

Verify that the requirements to perform the test using the​ t-distribution are satisfied. Check all that apply.

A. The​ students' test scores were independent of one another.

B. The sample size is larger than 30.

C. The students were randomly sampled.

D. None of the requirements are satisfied.

Currently, there is a debate in California about when, and how, to reopen businesses and schools. Since the lockdown, our economy has all but stopped. Most businesses have been forced to close, the numbers of unemployed workers are at levels not seen since the 1930s, and children are suffering from being out of school. Some are saying that if we don't get back to normal soon it will take us years to recover, if at all. Others are saying that if we reopen too soon, a second wave of the COVID virus will rival that of the deadly Spanish Flu, and the human and economic costs will be even worse - we've been here before. what course of action do you think we should take? Why?

selcet

Select an appropriate health promotion program/intervention that applies one of the economic evaluation methods:

4.1 Describe the scope of the chosen program/intervention?

4.2 Clearly define target population, place and time?

4.3 What is the method of cost analyses used to evaluate your program?

4.4 Why your program should conduct such analysis (the aims of the evaluation)?

4.5 Identify categories of costs that included?

4.6 What are the outcome measures used to assess the effect of this program /intervention?

if i select the below program

School-Based Health Centers: Cost–Benefit Analysis and Impact on Health Care Disparities

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2920971/

how can i answer questions

A 27-years old female presents to the Emergency Department of a local Hospital. She has a cough and complains of shortness of breath. An elevate temperature is noted along increased pulse rate. She states that her daughter had stayed home from school for the past few days and was diagnosed with an upper respiratory viral infection: a) What is the chief complaint? b) What I the etiology of her chief complaint? c) What follow-up questions would you ask about chief complaint? d) Are there any possible routes of transmission involved? Which one(s)? e) What would you do to keep from spreading this infection to other patients?

Find all the mistakes in the following student answers. Be specific. Then correctly answer each question. To create bell shaped curves use Link (Links to an external site.)

ACT English Scores In a recent year, the ACT scores for the English portion of the test were normally distributed, with a mean of 20.6 and a standard deviation of 6.3. A high school student who took the English portion of the ACT is randomly selected.

1. Find the probability that the student’s ACT score is less than 15.

P(x<15)

normalpdf(-10000, 15, 20.6, 6.3)

0.0427

2. Find the probability that the student’s ACT score is between 18 and 25.

P(18<x<25)

0.4176

1. (10) Evaluate each of the following statements – how does the situation affect the incentive to invest in a college degree? Why?

a. People who going into craft training programs such as carpentry or plumbing are making high wages.

b. A husband is planning to stay at home to raise his children.

c. Two siblings have entered college – one is a straight-A student with plenty of scholarships while the other maintained a 1.5 GPA in high school and must pay for most of their education out of pocket or through loans.

d. A college athlete receives a full scholarship to play hockey for the university he attends.

e. A 60-year old worker is deciding whether or not to pursue an MBA.

Resistance training is a popular form of conditioning aimed at enhancing sports performance and is widely used among high school, college, and professional athletes, although its use for younger athletes is controversial. A random sample of 4160 patients aged 8–30 admitted to U.S. emergency rooms with the Consumer Product Safety Commission code "weightlifting" were obtained. These injuries were further classified as "accidental" if caused by dropped weight or improper equipment use. Of the 4160 weightlifting injuries, 1560 were classified as accidental. Give a 90% confidence interval for the proportion of weightlifting injuries in this age group that were accidental. Follow the four-step process. (Round your answers to THREE decimal places.)

_____ to _____