According to the Centers for Disease Control, the mean number of cigarettes smoked per day by...

According to the Centers for Disease Control, the mean number of cigarettes smoked per day by individuals who are daily smokers is 18.1. A researcher claims that retired adults smoke less than the general population of daily smokers. To test this claim, she obtains a random sample of 25 retired adults who are current smokers, and records the number of cigarettes smoked on a randomly selected day. The data result in a sample mean of 16.8 cigarettes and a standard deviation of 4.8 cigarettes. Do the data support the claim that retired adults who are daily smokers smoke less than the general population of daily smokers? Conduct a hypothesis test at α = 0.10. Assume the population is normally distributed. Hint: σ is unknown, and this is a one-tailed test. (5 points) State the hypotheses 〖 H〗_0: H_1: b. Compute test statistic (Round to the nearest 100th) c. Find critical value (Round to the nearest 100th) d. State decision rule: e. State your conclusion. First, state either “Reject the null hypothesis” or “Fail to reject it.” Then, interpret your conclusion:

Expert Solution

a. Here claim is that retired adults who are daily smokers smoke less than the general population of daily smokers

So hypothesis is vs

b. As it is normal distribution but sigma is not known, we will use t distribution

c. The t-critical value for a left-tailed test, for a significance level of α=0.10 is

tc=−1.32

Graphically

d. If test statistics falls in the rejection region, reject the null hypothesis

e. Here we see that test statistics falls in the rejection region so we reject the null hypothesis

We have sufficient evidence to support the claim that retired adults who are daily smokers smoke less than the general population of daily smokers

milcah answered 10 months ago

1)A researcher believes that there is a correlation between the number of cigarettes smoked per day...

1)A researcher believes that there is a correlation between the number of cigarettes smoked per day and intelligence. The following data were collected on 15 smokers. Find Pearson's r. Number of cigarettes (X) IQ score (Y) 7 10 49 6 41 15 38 5 37 12 19 4 35 19 40 11 1 3 10 3 18 22 21 17 15 12 7 9 38 13 n=15 Sum of X= 376 Sum of Y=161 Sum...

According to the Centers for Disease Control and Prevention (CDC), the mean weight of U.S. men...

According to the Centers for Disease Control and Prevention (CDC), the mean weight of U.S. men of age 30–39 years old is191.802 pounds. Using the provided sample data file, conduct a one-sample ?-z-test of a mean to test whether the mean weight of men of age 30–39 years old who smoke daily is lower than191.802. Conduct the z-test at a significance level of α=0.05 to test the null hypothesis, H0:μ=191.802, against the alternative hypothesis, H1:μ<191.802, where ?μ represents the mean...

1) According to the Centers for Disease Control and Prevention (CDC), the mean total cholesterol level...

1) According to the Centers for Disease Control and Prevention (CDC), the mean total cholesterol level for persons 20 years of age and older in the United States from 2007–2010 was 197 mg/dL. a. What is the probability that a randomly selected adult from the population will have a total cholesterol level of less than 183 mg/dL? Use a standard deviation of 35 mg/dL and assume that the cholesterol levels for the population are normally distributed. b. What is the...

According to the Centers for Disease Control 50% of practicing physicians are in the specialty area...

According to the Centers for Disease Control 50% of practicing physicians are in the specialty area of primary care. Assuming that the same rate prevails, find the mean and standard deviation of the number of physicians specializing in primary care out of a current random selection of 545 medical graduates. 5.78 According to the Mendelian theory of inheritance of genes, offspring of a dihybrid cross of peas could be any of the four types: round-yellow (RY ), wrinkled-yellow (WY ),...

According to the Centers for Disease Control and Prevention (CDC), obesity in the U.S. population increased...

According to the Centers for Disease Control and Prevention (CDC), obesity in the U.S. population increased from about 12% in 1991 to about 34% in 2006. The highest increase occurred in 18- to 29-year-olds. Although part of the reason is our increasingly sedentary lifestyle, the principal cause is our overconsumption of abundant processed food products, many of which are high in fat and sugar content. Why do you think fat tastes good to so many people, and is difficult to...

1. According to the Centers for Disease Control and Prevention, we may assume that the heights...

1. According to the Centers for Disease Control and Prevention, we may assume that the heights of boys aged 8 years in the US have a mean height of 127.5cm with a standard deviation of 5.9cm, and we may assume that the distribution of these heights follow a normal distribution. a. What percentage of such boys have a height more than 135cm? b. What percentage of such boys have a height less than 125cm? c. What percentage of such boys...

Problem 4: Teen smoking According to a report published by the Centers for Disease Control and...

Problem 4: Teen smoking According to a report published by the Centers for Disease Control and Prevention, about 20 percent of high school students currently use a tobacco product. This number of down from 23 percent in 2014. (https://www.cdc.gov/tobacco/data_statistics/fact_sheets/youth_data/tobacco_use/index.htm). We would like to conduct a study to evaluate high school students’ attitudes toward scenes of smoking in the movies. Suppose you randomly select students to survey them on their opinion about this question. a) What is the probability that none...

According to the Centers for Disease Control and Prevention, average life expectancy has risen to 77.6...

According to the Centers for Disease Control and Prevention, average life expectancy has risen to 77.6 years. It has been suggested has rural areas in the Southwest have a shorter life span than the general population. In a random sample of 18 recently deceased residents of the rural Southwest, the average life span was 75.9, with a sample standard deviation of 9.8 years. a. State the null and alternative hypotheses to be used to test whether residents in the...

Suppose we are interested in knowing the effect of average number of cigarettes smoked by women...

Suppose we are interested in knowing the effect of average number of cigarettes smoked by women during pregnancy on infant birth weight ( in ounces). Suppose OLS regression estimates for the intercept and the slope coefficient are given as 119.77 and -.514 respectively. Interpret and

1. in a recent study, the centers for disease and control centers reported that diastolic blood...

1. in a recent study, the centers for disease and control centers reported that diastolic blood pressures of adult women in the united states are approximately normally distributed with a mean of 80.1 and a standard deviation of 9.5. a) what proportion of women have blood pressures lower then 62? b) what proportion of women have blood pressures between 69 and 87? c) a dialostic blood pressure greater than 90 is classified as hypertension (high blood pressure), what porportion of...

Question