12 and 13 12. Using a normal distribution and z score formula answer the following questions:...
12-13 show work 12. Using a normal distribution and z score formula answer the following questions: a. Find the Z-score that cuts off the top 35% of the nornval curve b. Find the data value to the nearest whole number that cuts off the bottom 20% of the curve given that the mean is 75 and sample standard deviation is 5. c. Find the z scores that cut off the middle 50% of the normal curve. 13. This question is...
12. Using a normal distribution and z score formula answer the following questions: a. Find the Z-score that cuts off the top 35% of the nornval curve b. Find the data value to the nearest whole number that cuts off the bottom 20% of the curve given that the mean is 75 and sample standard deviation is 5. c. Find the z scores that cut off the middle 50% of the normal curve. 13. This question is worth 4 points...
12. Using a normal distribution and z score formula answer the following questions: a. Find the Z-score that cuts off the top 35% of the nornval curve b. Find the data value to the nearest whole number that cuts off the bottom 20% of the curve given that the mean is 75 and sample standard deviation is 5. c. Find the z scores that cut off the middle 50% of the normal curve.
13. This question is worth 4 points only. A statistics professor has surveyed 225 NCC students to determine the cost of their textbooks for the semester. He determined that the sample mean was $425 with a population standard deviation of $75 i) Determine the standard error of a 95% confidence interval Determine the 95% confidence interval (round to the nearest whole number) iii) Determine the 99% confidence interval (round to the nearerst whole #) ii)
13. This question is worth 4 points only. A statistics professor has surveyed 225 NCC students to determine the cost of their textbooks for the semester. He determined that the sample mean was $425 with a population standard deviation of $75 i) Determine the standard error of a 95% confidence interval ii) Determine the 95% confidence interval (round to the nearest whole number) iii) Determine the 99% confidence interval (round to the nearerst whole #)
13. This question is worth 4 points only. A statistics professor has surveyed 225 NCC students to determine the cost of their textbooks for the semester. He determined that the sample mean was $425 with a population standard deviation of $75 i) Determine the standard error of a 95% confidence interval ii) Determine the 95% confidence interval (round to the nearest whole number) iii) Determine the 99% confidence interval (round to the nearerst whole #)
11. Use the following table to answer the questions X Y 7 18 8 23 10 28 13 32 37 16 41 20 45 52 14 26 a. Make a scatterplot and determine the relationship between X and Y b. Find the linear regression equation Y' = (round a and b to the nearest hundredth ) c. Find r and r’ to the nearest hundredth d. Use the equation found in part b to determine X to the nearest whole...
The difference between the T distribution and the standard normal (z) distribution decreases as the degrees of freedom increase. True False When estimating the number of responses to be collected in order to achieve a desired margin of error on a proportion, what value should be used for the population proportion if no estimate is available? Enter your answer as a decimal to 2 decimal places. A population is believed to have a standard deviation of 23.1. An analyst wants...
13. If we have a normal distribution with a mean of 75 and a standard deviation of 3. a. what z-score(s) would cut off the middle 40% of the distribution? b. what raw score(s) would cut off the lower 12% of the distribution? c, what raw score(s) would cut off the most extreme 5% of the distribution? d, what T-score(s) would cut off the upper 20% of the distribution? 13. If we have a normal distribution with a mean of...
(a) For a normal distribution, find the Z-score that cuts off the bottom 64.18% of all the z-scores. Round to 2 decimal places after the decimal point. answer: (b) For a normal distribution, find the Z-score that cuts off the top 58.89% of area. Round to 2 decimal places after the decimal point. answer: