A hypothetical study concerned with estimating the 187 amount of marijuana use per year among a teenage population obtained a sample of ll0 high-school students. With the following sample statistics, construct a 95-confidence interval around the mean number of times this sample uses marijuana in given 6-month period: Mean of the sample = 5.3; the standard deviation of the sample = 4.3 and the sample size = 110 What does the interval you constructed tell us about marijuana use in the population? Interpret these results.

Q: A random sample of 64 business students required an average of 100 minutes to complete a statistics…

A: Given that, Mean = 100 Standard deviation = 20 Sample size = 64 95% confidence level

Q: Julia enjoys jogging. She has been jogging over a period of several years, during which time her…

A: Given,sample size(n)=90sample mean(x¯)=15.61population standard…

Q: Independent students show that the average length of education of 70 r/s California adults is 12.7…

A: Confidence interval is an interval such that the probability of the unknown parameter to be included…

Q: Calculate a 90% confidence interval for the mean paired difference between  the two population means…

A: In testing of hypothesis, Level of Significance is the probability of rejecting a null hypothesis…

Q: A sample of n = 43 data values randomly selected from a normally distributed population has varlance…

A: Degrees of freedom = n-1=43-1=42 (by using the standard normal table)

Q: Construct a​ 95% confidence interval about the mean age.

A: Given Data : Sample Size, n = 32 Sample Mean, x̄ = 37.3 sample…

Q: A research company desires to know the mean consumption of meat per week among people over age 32.…

A:

Q: An experiment was designed to estimate the mean difference in weight gain for pigs fed ration A as…

A: Solution: A B d=A-B (d-d) (d-d)2 63 61 2 -3 9 57 52 5 0 0 64 54 10 5 25 51 45 6 1 1 45…

Q: use this to find a 95% confidence interval for the mean height of all red maple trees

A: The sample size is n = 146 Sample mean = 59 And sample SD = 12 Since the sample size is large then…

Q: 90% confidence

A: Given that  90% Confidence interval for mean = ( 75.3 to 80.9 ) Null hypothesis (Ho) : μ=70…

Q: A sample of 25 observations is taken from a normal distribution with unknown mean. The sample mean…

A:

Q: A study was commissioned to find the mean weight of the residents in certain town. The study…

A: Given: n=58, x=174 and s=38. Now,Degrees of freedom=n-1=58-1=57 Then, at 95% confidence level, the…

Q: You measure the blackbody temperature of the night sky three times and read: 7.3C, 9.1C, and 8.7C.…

A: Given : 1.   Temperature f night sky(in  degree celcies)    : 7.3, 9.1, and 8.7. 2.   Sample  mean =…

Q: A random sample of 100 observations produced a mean x̅ =38.5 and a standard deviation of 3.2. find a…

A: Given information Sample size(n) = 100 Sample mean x̅ =38.5 Sample standard deviation = 3.2…

Q: A survey conducted by the American Automobile Association (AAA) showed that a family of four spends…

A: Given that: Population mean, μ=215.60 n = 64 x¯=252.45 s = 74.50

Q: Construct a 90% Confidence Interval for the mean.

A: Let  be the population mean of water per day.Given that,Sample size Sample mean Sample standard…

Q: A study investigated the effectiveness of meditation training in reducing trait anxiety. The study…

A: Given : n = 27 mean = 4.7 standard deviation = 6.8

Q: In 2002, the mean age of an inmate on death row was 40.7 years with a standard deviation of 9.6…

A: Sample mean =[x] =38.9 Standard deviation =[σ] =9.6 sample size [n] =32 Confidence interval =95%

Q: A recent survey of 8 social network sites has a mean of 13.1 million visitors for a specific month.…

A: Given that, Mean = 13.1 Standard deviation = 3.1 Sample size = 8

Q: When you calculate a Confidence Interval (CI) for the difference between two population mean values,…

A: If the confidence interval CI for the difference between the two population mean includes zero, then…

Q: Suppose scores on exams in Biology are normally distributed with an unknown population mean and a…

A: given data σ = 5.4n = 60 x¯ = 81find 90% ci for μ = ?

Q: A researcher takes a sample of 25 people and calculates a 90% confidence interval of (4,24) for a…

A: The confidence interval is (4,24).

Q: A sociologist develops a test to measure attitudes about public transportation, and 27 randomly…

A: We have to find out confidence interval..

Q: One​ year, the mean age of an inmate on death row was 38.1years. A sociologist wondered whether the…

A:

Q: 17.18  4S overall mortality. The 4S study introduced in Exercise 17.17 also tallied deaths due to…

A:

Q: Suppose we gather a random sample of 20 data points. Assume the population standard deviation is 11.…

A: Given,   Sample size = 20 Sample mean = 23 Population standard deviation = 11   Since the population…

Q: A random sample of 250 students at a university finds that these students take a mean of 15 credit…

A: Solution: From the given information, the 99% confidence interval for the mean credit hours is…

Q: 20 TV remote controls were followed over the years to find the mean lifespan of this model. The…

A: Answer - Here  n = 20 TV remote controls were followed  over the years to find the mean…

Q: sample of seven laptop computers had a variance of 25.88 years when the lifespan of the computer was…

A:

Q: Suppose that you randomly survey death records for people born in 1900 in Louisiana and compared the…

A:

Q: A random sample of 50 roundtrip flights between New York and Chicago has an average airfare of $400…

A: Given : A random sample of 50 round-trip flights between New York and Chicago has an average airfare…