2. We want to estimate the proportion of Americans who support national marijuana legalization. We want to limit the margin of error of a 95% confidence interval to 2%, about how many Americans would we need to survey if... (a) no information is known about the population proportion. (b) we have a rough estimate from a previous survey that the proportion who support national rijuene logelizotion ig 610%

2. We want to estimate the proportion of Americans who support national marijuana legalization. We want to limit the margin of error of a 95% confidence interval to 2%, about how many Americans would we need to survey if... (a) no information is known about the population proportion. (b) we have a rough estimate from a previous survey that the proportion who support national rijuene logelizotion ig 610%

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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QUESTION 5 The health department is estimating the percentage of smokers among adults aged between 18-22. A random sample of 50 students was used and 16 are reported as smokers. Find the corresponding critical value for calculating 97.5% confidence interval. Round your answer to three decimal places.
Question 5 Assume that a sample is used to estimate a population mean p. Find the 90% confidence interval for a sample of size 71 with a mean of 57.2 and a standard deviation of 20.7. Enter your answer as an open- interval (i.e., parentheses) accurate to one decimal place (because the sample statistics are reported accurate to one decimal place). 90% C.I. %3D Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places. Submit Question
QUESTION 16 In 2005, Health Canada claimed that 16.6% of Canadian adults are obese. A researcher wanted to check whether this percentage has increased in 2009. He randomly selected 160 Canadian adults and found 30 of them are obese. He wants to develop a 92% confidence interval for the obese percentage in 2009. Write down the critical value
QUESTION 17 Suppose an internet marketing company wants to determine the current percentage of customers who click on ads on their smartphones. A random sample of 1000 customers is selected and 120 of them click on ads on their smartphones. Find the upper confidence limite (UCL) of the 98% confidence interval estimate for the population proportion of customers who click on ads on their smartphones. Round your answer to three decimal places.
4. Please help me answer this including the z-table.
Question 2: In order to determine the miles per gallon rating for a new midsize minivan, an automaker randomly selected a sample of 50 vehicles. The showed = 31.56 mpg with s=.798 mpg. At 95% confidence, what is the minimum mpg rating you could give the car?
Step 2 of 3: Compute the value of the test statistic. Round your answer to three decimal places. tep 3 of 3: Draw a conclusion and interpret the decision.
Question 5, 8.3.49
Question 2
question 3
1. The data in Table 7–6 were collected in a clinical trial to evaluate a new compound designed to improve wound healing in trauma patients. The new compound was com- pared against a placebo. After treatment for 5 days with the new compound or placebo, the extent of wound healing was measured. Is there a difference in the extent of wound healing between the treatments? (Hint: Are treatment and the percent wound healing independent?) Run the appropriate test at a 5% level of significance. Use the data in Problem 1. Pool the data across the treatments into one sample of size n = 250. Use the pooled data to test whether the distribution of the percent wound healing is approximately normal. Specifically, use the following distribution 30%, 40%, 20%, and 10% and a = 0.05 to run the appropriate test. Percent Wound Healing Treatment 0-25% 26-50% 51-75% 76-100% New compound (n=125) 15 37 32 41 Placebo (n=125) 36 45 34 10