statistics question about smoking before 18 years of age
According to an almanac, 70% of adult smokers started smoking before turning 18 years oh When technology is used, use the Tech Help button for further assistance.
(a) Compute the mean and standard deviation of the random variable X, the number of smokers who started before 18 in 100 trials of the probability experiment
(b) Interpret the mean.
(c) Would it be unusual to observe 80 smokers who started smoking before turning 18 years old in a random sample of 100 adult smokers? Why? (a) Mu x =0.18 Sigma x= D (Round to the nearest tenth as needed.)
(b) What is the correct interpretation of the mean?
A. It is expected that in a random sample of 100 adult smokers, 70 will have started smoking after turning 18.
B. It is expected that in a random sample of 100 adult smokers, 70 will have started smoking before turning 18
C. It is expected that in 50% of random samples of 100 adult smokers, 70 will have started smoking before turning 18.
(c) Would ft be unusual to observe 80 smokers who started smoking before turning 18 years old in a random sample of 100 adult smokers?
A. No, because 80 is less than \(\mu-2 \sigma\).
B. Yes, because 80 is between \(\mu-2 \sigma\) and \(\mu+2 \sigma\).
C. Yes, because 80 is greater than \(\mu+2 \sigma\).
D. No, because 80 is between \(\mu-2 \sigma\) and \(\mu+2 \sigma\).
E. No, because 80 is greater than \(\mu+2 \sigma\).
statistics question about smoking before 18 years of age According to an almanac, 70% of adult smokers started smokin...
According to an almanac, 80% of adult smokers started smoking before turning 18 years old. (a) If 400 adult smokers are randomly selected, how many would we expect to have started smoking before turning 18 years old? (b) Would it be unusual to observe 360 smokers who started smoking before turning 18 years old in a random sample of 400 adult smokers? Why?
According to an almanac, 80% of adult smokers started smoking before turning 18 years old. When technology is used, use the Tech Help button for further assistance. (a) Compute the mean and standard deviation of the random variable X, the number of smokers who started before 18 in 200 trials of the probability experiment. (b) Interpret the mean. (c) Would it be unusual to observe 170 smokers who started smoking before turning 18 years old in a random sample of 200 adult smokers?...
Question 11 2 pts 11. According to an almanac, 55% of adult smokers started smoking before turning 18 years old. Compute the standard deviation of the random variable X, the number of smokers who started before 18 in 300 trials of the probability experiment. Round your answer to one decimal place. 7.5 0 o 9.1 6.7 8.6
It it is known that 80% of adult smokers started smoking before turning 18 years old. Suppose 10 smokers 18 years old or older are randomly selected and the number of smokers who started smoking before 18 is recorded. Find the probability that between 7 and 9 of them started smoking before 18 years of age. Select one: a. 0.5033 b. 0.7718 c. 0.5704 d. 0.2282
Seventy-five percent of adult smokers started smoking before turning 18 years old. If 20 adult smokers are randomly chosen, find the probability that at most 6 of them started smoking after they turned 18.
Adult diabetes: A National Center for Health Statistics data brief states that in 2013 9% of US. adults aged 18 and over have diagnosed diabetes. Suppose that this year, we select a random sample of 100 adults. The conditions are not met for use of a normal model since the expected number of adults with diagnosed diabetes is only 9 (9% of 100). Therefore, we ran a simulation withp = 0.09. Suppose that the sample has 15 adults (or 15%)...
According to a consumer survey of young adults (18-24 years of age) who shop online, 30% own a mobile phone with internet access. In a random sample of 400 young adults who shoponline, let x be the number who own a mobile phone with internet access. a. Explain why x is a binomial random variable (to a reasonable degree of approximation). Choose the correct explanation below. A. The experiment consists of n identical, dependent trials, where there are only two...
According to a consumer survey of young adults (18-24 years of age) who shop online, 29% own a mobile phone with internet access. In a random sample of 400 young adults who shop online, let x be the number who own a mobile phone with internet access. a. Explain why x is a binomial random variable (to a reasonable degree of approximation). Choose the correct explanation below. A. The experiment consists of n identical, dependent trials, with more than two...
According to a survey in a country, 10% of adults do not own a credit card. Suppose a simple random sample of 300 adults is obtained. Complete parts (a) through (d) below (a) Describe the samping distribution of the sample proportion of adults who do not own a credit card. Choose the phrase that best describes the shape of the sampling diatribution of below. O A. Approximately normal becausens OSN and noft-p) 10 OB. Not normal because ns0.05N and npit-p)<...
Lung Cancer & Smoking Case Study A causal relationship between cigarette smoking and lung cancer was first suspected in the 1920s on the basis of clinical observations. To test this apparent association, numerous epidemiologic studies were undertaken between 1930 and 1960. Two studies were conducted by Richard Doll and Austin Bradford Hill in Great Britain The first was a case-control study begun in 1947 comparing the smoking habits of lung cancer patients with the smoking habits of other patients. The...