# SOLUTION: Please help me solve these problems. 1. Calculate the sample mean and standard deviation for the age of Bigcone Douglas-fir trees based on the data above. If this accurately repr

Algebra ->  Algebra  -> Probability-and-statistics -> SOLUTION: Please help me solve these problems. 1. Calculate the sample mean and standard deviation for the age of Bigcone Douglas-fir trees based on the data above. If this accurately repr      Log On

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 Question 402962: Please help me solve these problems. 1. Calculate the sample mean and standard deviation for the age of Bigcone Douglas-fir trees based on the data above. If this accurately represents the population mean and standard deviation for the age of surviving Bigcone Douglas-fir trees in the burn area, what is the probability that a randomly selected surviving Bigcone Douglas-fir tree from the burn area will be less than 0 years old? Round to the nearest hundredth. Based on this result, is it logical to assume that the population of age of surviving Bigcone Douglas-fir trees in the burn area is normally distributed with the parameters identified. 2.Determine the appropriate approach to conduct a hypothesis test for this claim: Fewer than 5% of patients experience negative treatment effects. Sample data: Of 500 randomly selected patients, 2.2% experience negative treatment effects. A) Use the normal distribution. B) Use the Student t distribution. C) Use the chi-square distribution. D) Use nonparametric or bootstrapping methods 3. Determine the appropriate approach to conduct a hypothesis test for this claim: The systolic blood pressure of men who run at least five miles each week varies less than does the systolic blood pressure of all men. Sample data: n = 100 randomly selected men who run at least five miles each week, sample mean = 108.4, and s = 20.3 A) Use the normal distribution. B) Use the Student t distribution. C) Use the chi-square distribution. D) Use nonparametric or bootstrapping methods. 4. Determine the appropriate approach to conduct a hypothesis test for this claim: The mean sodium content of a 30 g serving of snack crackers is 2,200 mg. Sample data: n = 130 snack crackers, sample mean = 3,100 mg, and s = 570. The sample data appear to come from a normally distributed population (0.5 point). A) Use the normal distribution. B) Use the Student t distribution. C) Use the chi-square distribution. D) Use nonparametric or bootstrapping methods Thank you very much, Lara Answer by stanbon(57967)   (Show Source): You can put this solution on YOUR website!1. Calculate the sample mean and standard deviation for the age of Bigcone Douglas-fir trees based on the data above. If this accurately represents the population mean and standard deviation for the age of surviving Bigcone Douglas-fir trees in the burn area, what is the probability that a randomly selected surviving Bigcone Douglas-fir tree from the burn area will be less than 0 years old? Round to the nearest hundredth. Based on this result, is it logical to assume that the population of age of surviving Bigcone Douglas-fir trees in the burn area is normally distributed with the parameters identified. ---- Comment: No data was posted and number(s) are missing from the post of this #1 problem. ================================================== 2.Determine the appropriate approach to conduct a hypothesis test for this claim: Fewer than 5% of patients experience negative treatment effects. Sample data: Of 500 randomly selected patients, 2.2% experience negative treatment effects. A) Use the normal distribution. B) Use the Student t distribution. C) Use the chi-square distribution. D) Use nonparametric or bootstrapping methods Ans: It's a proportion test. Use the normal distribution. ================================================= 3. Determine the appropriate approach to conduct a hypothesis test for this claim: The systolic blood pressure of men who run at least five miles each week varies less than does the systolic blood pressure of all men. Sample data: n = 100 randomly selected men who run at least five miles each week, sample mean = 108.4, and s = 20.3 A) Use the normal distribution. B) Use the Student t distribution. C) Use the chi-square distribution. D) Use nonparametric or bootstrapping methods. Ans: It's a means test. Use the t-distribution =================================================== 4. Determine the appropriate approach to conduct a hypothesis test for this claim: The mean sodium content of a 30 g serving of snack crackers is 2,200 mg. Sample data: n = 130 snack crackers, sample mean = 3,100 mg, and s = 570. The sample data appear to come from a normally distributed population (0.5 point). A) Use the normal distribution. B) Use the Student t distribution. C) Use the chi-square distribution. D) Use nonparametric or bootstrapping methods Ans: Means test. Use the t-distribution. =================================================== Cheers, Stan H. ===========