The mother of a seven-year-old boy notices that he is scratching his head frequently. On close examination she notices a grayish, round, and roughened area where the hair has broken off. Examination by the child's pediatrician produces a diagnosis of tinea capitis.

1. Explain the cause of the infection and proposed possible mechanisms for spread of infection in school-age children, particularly during winter months.

2. What methods are commonly used in the diagnosis  superficial fungal infections?

Scores on a certain nationwide college entrance examination follow a normal distribution with a mean of 500 and a standard deviation of 100. Find the probability that a student will score...

a) over 650

b) less than 459

c) between 325 and 675

d) If a school only admits students who score over 680, what proportion of the student's pool would be eligible for admission?

e) what limit (score) would you set that makes the top 20% of the students eligible?

After the ISO9000 procedure is introduced by the Ministry of Education, the Utopia Island Teachers’ Union claims that school teachers have spent more than 2 hours on paper work every week, and as the result, the teaching quality has been affected. A random check with 50 teachers from different schools in the island has shown that teachers spent an average 2.5 hours of paperwork on weekly basis. Test whether the claim by Utopia Island Teachers’ Union is valid.

Scores on a certain nationwide college entrance examination follow a normal distribution with a mean of 500 and a standard deviation of 100. Find the probability that a student will score...

a) over 650

b) less than 459

c) between 325 and 675

d) If a school only admits students who score over 680, what proportion of the student's pool would be eligible for admission?

e) what limit (score) would you set that makes the top 20% of the students eligible?

1. chase is an athlete who weighs 90 kg. He should consume ________ g of protein daily.

Multiple Choice

• 85 to 110

• 95 to 115

• 78 to 140

• 108 to 180

2. In the United States, the diets of many school-age children do not supply enough ________.

Multiple Choice

• vanadium

• simple carbohydrates

• sodium

• fiber

3. ________ is a common condition that occurs in healthy pregnant women.

Multiple Choice

• Physiological anemia

• Preeclampsia

• Gestational diabetes

• Gestational hypertension

You decide to study the effect of GRE preparatory course on GRE score. Describe, in detail, how you will design your study, how you will collect data, and how you are going to statistically test whether the GRE course had an effect on GRE score. Be as specific as you can about your hypotheses. How would you, if at all, change your study if you decided to study the effect of the GRE preparatory course on graduate school admission instead?

To test whether extracurricular activity is a good predictor of college success, a college administrator records whether students participated in extracurricular activities during high school and their subsequent college freshman GPA.

LEFT side of column: Activity RIGHT side: College GPA

(a). Code the dichotomous variable and then compute a point-biserial correlation coefficient. (Round your answer to three decimal places.)

1. A study was conducted of recent high school graduates who began full-time jobs rather than going to college. We wish to find the average starting income µ of such workers. A random sample of size 60 gave a sample mean of $24,500 with a population standard deviation of $2350.Round answers to 2 decimal places.

1. Find the standard error.

2. Identify the upper and lower z score for a 95% confidence interval for µ.

3. Calculate the upper and lower bounds of the confidence interval.

1. A study was conducted of recent high school graduates who began full-time jobs rather than going to college. We wish to find the average starting income µ of such workers. A random sample of size 60 gave a sample mean of $24,500 with a population standard deviation of $2350.Round answers to 2 decimal places.

1. Find the standard error.

2. Identify the upper and lower z score for a 95% confidence interval for µ.

3. Calculate the upper and lower bounds of the confidence interval.