QUESTION 1 A health club is interested in knowing how many times a typical member uses the club in a week. They decide to ask every tenth customer on a specified day to complete a short survey including information about how many times they have visited the club in the past week. What kind of a sampling design is this? O A. cluster O B. stratified O C. simple random O D. systematic QUESTION 2 A health club is interested in knowing how many times a typical member uses the club in a week. They decide to ask every tenth customer on a specified day to complete a short survey including information about how many times they have visited the club in the past week. "Number of visits per week" is what kind of data? O A. qualitative O B. quantitative-continuous O C. quantitative-discrete O D. qualitative - discreteQUESTION 8 Below is the probability distribution of the length of stay in a hospital after a minor operation. Number of days, X P(x) 1 0.1 2 0.15 ? 0.5 What is the probability of x = 3? O A. 1 O B. 0.41 O C. 0.25 O D. 0.75QUESTION 13 In a community, 15% of adolescent girls have iron deficiency. Suppose twenty adolescent girls are chosen at random, what is the expected number of adolescent girls to have iron deficiency? O A. 20 O B. 17 O C. 10 OD. 3 QUESTION 14 Scores on the math section of a college entrance exam are normally distributed with mean u = 22.7 and o = 3.1. What is the probability that a randomly selected test taker will score 25 or higher on the math section of the college entrance exam? O A. 0.2580 O B. 0.2704 O C. 0.7704 O D. 0.2291QUESTION 9 Below is the probability distribution of the length of stay in a hospital after a minor operation. Number of days, X P(x) 0.1 2 0.15 ? 0.5 What is the mean (expected value) length of stay? (please take for X=3, the value of P(x) that you calculated in prevoius question) O A. 3.15 O B. 1 O C. 2.5 OD. 4 QUESTION 10 If a sample of 40 is taken from a population whose standard deviation is equal to 15, what is the standard error of the mean? O A 2.37 O B. 10.33 O C. 5.48 OD. 1QUESTION 3 Which of the following is a qualitative variable? O A. annual salary O B. number of sibilings O C. the amount of fats (in grams) in 5 cookies O D. eye color of students QUESTION 4 Which of the following sampling techniques is an equal probability selection method in which every individual in the population has an equal chance of being selected? O A. Simple Random Sample O B. Systematic Sampling O C. Stratified Sample O D. Cluster Random Sampling QUESTION 5 An education researcher randomly selects 38 schools from one school district and interviews all the teachers at each of the 38 schools. What type of sampling technique is used? O Simple Random Sample O Systematic Sampling O Stratified Sampling O Cluster SamplingQUESTION 6 For a normal distribution with mean equal to 80 and standard deviation equal to 3, approximately what percent of the observation will be between 74 and 86? O A. 50 O B. 68 O C. 95 O D. 99.7 QUESTION 7 Which of the following is not true in a standard normal distribution? O A. It has a mean of 0 and a standard deviation of 1. O B. The mean, median and mode are all equal to 0. O C. The total area under the normal curve is equal to 1. O D. The highest point on the normal curve is the standard deviation.QUESTION 15 Scores on the math section of a college entrance exam are normally distributed with mean u = 22.7 and o = 3.1. What is the probability that a randomly selected test taker will score lower than 25 on the math section of the college entrance exam? O A. 0.2580 O B. 0.2704 O C. 0.7709 O D. 0.2296 QUESTION 16 h Scores on the math section of a college entrance exam are normally distributed with mean u = 22.7 and o = 3.1. If five test takers are randomly selected, what is the probability that they have a mean score of 25 or higher on the math section of the college entrance exam? O A. 0.0485 O B. 0.9515 O C. 0.4515 O D. 0.2296QUESTION 17 Midterm grades of students in statistics class are approximately normal with a mean of 82 and a standard deviation of 4. Which choice correctly describes how to find the proportion of students that have a midterm grade lower than 86? O A. Find the area to the left of z = 1 under a standard normal curve. O B. Find the area between z = -1 and z = 1 under a standard normal curve. O C. Find the area to the right of z = 1 under a standard normal curve. O D. Find the area to the right of z = -1 under a standard normal curve. QUESTION 18 What would happen to the confidence interval if you calculated a 99% confidence interval rather than a 95% confidence interval? O A. It will be narrower O B. It will not change O C. The sample size will increase O D. It will become widerQUESTION 11 In a community, 15% of adolescent girls have iron deficiency. What is the probability that the first adolescent girl chosen who have iron deficiency is the third adolescent girl chosen? O A. 0. 1084 O B. 0.2953 O C. 0.0783 OD. 0.0921 QUESTION 12 In a community, 15% of adolescent girls have iron deficiency. Suppose twenty adolescent girls are chosen at random, what is the probability that exactly 5 of the 20 girls will be iron deficient? O A. 0.5224 O B. 0.0783 O C. 0.0004 O D. 0. 1028