Please I need help with these questions. Please note each picture has a number in the left corner of it, example 7.1.13 please use those numbers to identify the solutions and explanations example 7.1.13 ...... The reason I say that, is because is going to help me to identify them faster. Thanks for comprehension and support, Thanks! Also note that most of them has been already answered, don't need explanations or solutions for those has been already answered, only for those are needed of it. Thanks! ?
7.2.33-T Assigned Media Question Help The ages of a group of 120 randomly selected adult females have a standard deviation of 16.5 years. Assume that the ages of female statistics students have less variation than ages of females in the general population, so let 6 = 16.5 years for the sample size calculation. How many female statistics student ages must be obtained in order to estimate the mean age of all female statistics students? Assume that we want 95% confidence that the sample mean is within one-half year of the population mean. Does it seem reasonable to assume that the ages of female statistics students have less variation than ages of females in the general population? The required sample size is 4184 (Round up to the nearest whole number as needed.) Does it seem reasonable to assume that the ages of female statistics students have less variation than ages of females in the general population? O A. Yes, because statistics students are typically younger than people in the general population. O B. Yes, because statistics students are typically older than people in the general population. O C. No, because statistics students are typically older than people in the general population. O D. No, because there is no age difference between the population of statistics students and the general population.7.3.7-T Assigned Media Question Help Use the given information to find the number of degrees of freedom, the critical values x- and yo , and the confidence interval estimate of o. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution. Platelet Counts of Women 95% confidence; n = 28, s = 65.6. Click the icon to view the table of Chi-Square critical values. df = 27 (Type a whole number.) X7 = 14.573 (Round to three decimal places as needed.) XR = (Round to three decimal places as needed.)7.3.21 Assigned Media Question Help Assume that the sample is a simple random sample obtained from a normally distributed population of flight delays at an airport. Use the table below to find the minimum sample size needed to be 99% confident that the sample standard deviation is within 40% of the population standard deviation. A histogram of a sample of those arrival delays suggests that the distribution is skewed, not normal. How does the distribution affect the sample size? To be 95% confident that s is 1% 5% 10% 20% 30% 40% 50% within of the value of o, the sample size 19,205 768 192 48 21 12 8 n should be at least To be 99% confident that s is 1% 5% 10% 20% 30% 40% 50% within of the value of o, the sample size 33,218 1,336 336 85 38 22 14 n should be at least The minimum sample size needed is 22 A histogram of a sample of those arrival delays suggests that the distribution is skewed, not normal. How does the distribution affect the sample size? O A. The computed minimum sample size is not likely correct. O B. The computed sample size should be multiplied by 2. O C. The computed sample size should be divided by 2. O D. The computed minimum sample size is likely correct.7.1.13 Assigned Media Question Help Use the sample data and confidence level given below to complete parts (a) through (d). A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll, n = 1058 and x = 529 who said "yes." Use a 90% confidence level. Click the icon to view a table of z scores. a) Find the best point estimate of the population proportion p. 0.500 (Round to three decimal places as needed.) b) Identify the value of the margin of error E. E= 0.025 (Round to three decimal places as needed.) c) Construct the confidence interval.
