1) Industry Research polled teenagers on sunscreen use. The survey revealed that 46% of teenage girls...

1) Industry Research polled teenagers on sunscreen use. The survey revealed that 46% of teenage girls and 30% of teenage boys regularly use sunscreen before going out in the sun.

identify the two populations
A. teenage girls and teenage boys who use sunscreen regularly
B. all teenagers
C. teenage girls and teenage boys
D. None of the above

identify the specified attribute
A. being a teenage girl or a teenage boy
B. being a teenager
C. uses sunscreen before going out in the sun
D. None of the above

are the proportions 0.46 (46%) and 0.30 (30%) population proportions or a sample proportions?
A. population proportions
B. sample proportions
C. None of the above

2) Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false.

? True False 1. The number of degrees of freedom associated with the ?t test, when the data are gathered from a matched pairs experiment with 10 pairs, is 9.

? True False 2. The best estimator of the difference between two population means ?1−?2 is the difference between two sample means ?¯1−?¯2x

? True False 3. In testing the difference between two population means using two independent samples, the sampling distribution of the sample mean difference ?¯1−?¯2x is normal if the sample sizes are both greater than 30.

? True False 4. A political analyst in Iowa surveys a random sample of registered Democrats and compares the results with those obtained from a random sample of registered Republicans. This is an example of two independent samples.

Expert Solution

Question 1

(a) Here the two population are "Teenage boys" and "Teenage Girls".

(b) Here specific attribute is "C. uses sunscreen before going out in the sun"

(c) These are sample proportions.

Question 2

(1) The number of degrees of freedom associated with the ?t test, when the data are gathered from a matched pairs experiment with 10 pairs, is 9. TRUE

(2) The best estimator of the difference between two population means ?1−?2 is the difference between two sample means ?¯1−?¯2x. TRUE

(3) In testing the difference between two population means using two independent samples, the sampling distribution of the sample mean difference ?¯1−?¯2x is normal if the sample sizes are both greater than 30. FALSE

(4) A political analyst in Iowa surveys a random sample of registered Democrats and compares the results with those obtained from a random sample of registered Republicans. This is an example of two independent samples.FALSE

orchestra answered 2 years ago

1: A survey questioned 1,000 high school students. The survey revealed that 46% are honor roll...

1: A survey questioned 1,000 high school students. The survey revealed that 46% are honor roll students. Of those who are honor roll students, 45% play sports in school and 21% of those that are not honor roll students, don't play sports. What is the probability that a high school student selected at random plays sports in school? 2: One of two small classrooms is chosen at random with equally likely probability, and then a student is chosen at random...

Marketing companies have collected data implying that teenage girls use more ring tones on their cellular...

Marketing companies have collected data implying that teenage girls use more ring tones on their cellular phones than teenage boys do. In one particular study of 40 randomly chosen teenage girls and boys (20 of each) with cellular phones, the average number of ring tones for the girls was 3.4 with a standard deviation of 1.7. The average for the boys was 1.6 with a standard deviation of 0.7. Conduct a hypothesis test at the 5% level to determine if...

A survey of 490 women revealed that 49% wear flat shoes to work. a. Use this...

A survey of 490 women revealed that 49% wear flat shoes to work. a. Use this sample information to develop a 95% confidence interval for the population proportion of women who wear flat shoes to work. b. Suppose that the people who administered this survey now wish to estimate the proportion of women who wear athletic shoes to work with a margin of error of 0.01 with 99% confidence. Determine the sample size required.

a human resource survey revealed that 30% of job applicants cheat on their psychometric test. use...

a human resource survey revealed that 30% of job applicants cheat on their psychometric test. use the binomial formula to find the probability that the number of job applicants in a sample of 14 who cheat on their psychometric test is: a. exactly 8 b. less than 2 c. at least 1

(1) A survey of 100 grocery stores revealed that the average price of a gallon of...

(1) A survey of 100 grocery stores revealed that the average price of a gallon of milk was $3.00, with a population standard deviation of $0.20. What is the 95% confidence interval of the true cost of a gallon of milk?

A recent Pew Center Research survey revealed that 68% of high school students have used tobacco...

A recent Pew Center Research survey revealed that 68% of high school students have used tobacco related products. Suppose a statistician randomly selected 20 high school students. Use this information to answer questions 39-41. To find the probability that exactly 15 used tobacco products, would you use the Binomial, Geometric, or Poisson distribution to find the probability? Set up the problem to find P (X = 15) using the appropriate distribution. Do NOT solve. What is the expected number of...

1. The General Social Survey polled a sample of 209 people aged 18-30 in the year...

1. The General Social Survey polled a sample of 209 people aged 18-30 in the year 2000, asking them how many hours per week they spend on the internet. The sample mean was 6.75 with a standard deviation of 7.71. A second sample of 541 people aged 18-30 was taken in 2006. For this sample, the mean was 7.34 and standard deviation of 10.93. Assume these are simple random samples from populations of people aged 18-30. Can you conclude that...

2. A Survey of 500 women revealed 40% wear flats to work. Use the sample information...

2. A Survey of 500 women revealed 40% wear flats to work. Use the sample information to develop a 99% confidence interval estimate for the Population proportion of women who wear flats to work. Suppose we wish to estimate the proportion of women who wear atheletic shoes to work with a margin of error of ± 0.05 at 98% confidence , determine the sample size required.

1.) A recent survey showed that high school girls average 110 text messages daily. The population...

1.) A recent survey showed that high school girls average 110 text messages daily. The population standard deviation is 25 text messages. 1 In repeated samples of size n = 64 high school girls, the expected value of the sample mean is, a 1.719 b 10.488 c 13.75 d 110 2.) In repeated samples of size n = 64 high school girls, the standard error of the sample mean is, a 25 b 5 c 3.125 d 0.391 3.) In...

1. The National Comorbidity Survey Replication (NCS-R) study revealed that psychological disorders are: rampant in Asian...

1. The National Comorbidity Survey Replication (NCS-R) study revealed that psychological disorders are: rampant in Asian countries. more prevalent than people believe. virtually nonexistent. less prevalent than many people believe. 2. Many factors contribute to why people in need of mental health treatment do not receive it. Of the following, which is NOT one of these factors? lack of insurance living in a city living in a rural area fear of being stigmatized 3. Which of the following was classified...

Question