What is the overlap of Data Set 1 and Data Set 2? high moderate low none Two line plots aligned vertically so that their labels
match. The first line plot is from 20 to 60, is labeled Data Set 1, and shows the following values that appear as x marks above the line. One x mark above 20. Three x marks above 25. Three x marks above 30. Two x marks above 35. One x mark above 40. The second line plot is also from 20 to 60, is labeled Data Set 2, and shows the following values that appear as x marks above the line. One x mark above 35. Two x marks above 40. Three x marks above 45. Two x marks above 50. One x mark above 55. One x mark above 60. Image: Do not include the blue squiggly lines under the Xs.
2 answers:
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Answer:
(1)
(2)
The critical value for 95% of confidence interval now can be founded using the normal distribution. And in excel we can use this formla to find it:"=-NORM.INV(0.025,0,1)", and we got , replacing into formula (2) we got:
So the answer for this case would be n=25 rounded up to the nearest integer
Step-by-step explanation:
Previous concepts
A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".
The margin of error is the range of values below and above the sample statistic in a confidence interval.
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
represent the sample mean for the sample
population mean (variable of interest)
represent the population standard deviation
n represent the sample size (variable of interest)
The confidence interval for the mean is given by the following formula:
The margin of error is given by this formula:
(1)
And on this case we have that ME =0.02 and we are interested in order to find the value of n, if we solve n from equation (1) we got:
(2)
The critical value for 95% of confidence interval now can be founded using the normal distribution. And in excel we can use this formla to find it:"=-NORM.INV(0.025,0,1)", and we got , replacing into formula (2) we got:
So the answer for this case would be n=25 rounded up to the nearest integer