Question 1 {1 point] When should you use the Student's t-distribution? {Select ALL that apply} B When you know the sample standard deviation C] When you have a small sample {MED} C] When you know the population standard deviation Question 2 {1 point] You are studying a population with an unknown standard deviation or mean. You collect data with a sample of size n=20. What distribution should you use? 0 Student's t-distribution O Normal distribution Question 3 {1 point] You are studying a population with an unknown standard deviation or mean. You collect data with a sample of size F100. What distribution should you use? 0 Student's t-distribution 0 Normal distribution Question 4 {1 point] You are studying a population with a mean of an and a standard deviation of 3. You collect data on a sample of size n=50. What distribution should you use? 0 Student's t-distribution C} Normal distribution Question 5 {1 point] Which of the following affect the width of a confidence interval {assuming t- distribution]? Sample size Sample mean Sample standard deviation Question 6 (1 point) Emily drew a sample of 20 brownies to study calorie counts, and she found a 95% confidence interval of (275, 325). Which is the correct interpretation of the 95% confidence interval? )You are 95% certain that Emily has a problem with brownies. )You are 95% certain that the true mean can be found in a sample of 275 to 325 brownies. ()You are 95% certain that a sample of 20 brownies will find 300 calories per brownie. )You are 95% certain that the true mean calories per brownie is between 275 and 325. Question 7 (1 point) You are studying a population with an unknown standard deviation. You collect data on a sample of size n=25. How many degrees of freedom do you have? O 23 O 24 O 25 O 26 27 Question 8 (1 point) You are performing a 2-sample t-test on samples from 2 populations. Each sample has 15 data points in it. How many degrees of freedom do you have?O 14 O 15 O 16 O 28 29 O 30 Question 9 (2 points) You want to test the claim that a population's mean is 100. Match the null hypothesis and alternative hypothesis accordingly. 1. u = 100 Null hypothesis, Ho 2. H > 100 Alternative hypothesis, Ha 3. u # 100 4. x = 100 Question 10 (2 points) The average weight of a full-grown male golden retriever is 70lbs. A breeder changes their dog food brand to see if their dogs' weights change. Match the null hypothesis and alternative hypothesis accordingly. 1. H = 70 Alternative hypothesis, Ha 2. X > 70 Null hypothesis, Ho 3. H # 70 4. X = 70