1. How can you make a 95% confidence interval smaller without changing the confidence level?

Q: 2. Why do we feel more confident with a 99 percent confidence interval than a 90 percent confidence…

A: It is needed to define the reason for being more confident for a 99% confidence interval than a 90%…

Q: (a) Number of successes x= 135 (b) n = 640 (c) Probability of success p'= 0.21 (d) Probabilty of…

A: Given that  135 of the 640 96% confidence interval

Q: Suppose you want to produce an estimate on the percent of students who return to college after their…

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Q: Why does increasing the confidence level result in a larger margin of error?

A: We know that the Margin of error is directly proportional to the test statistic's critical value,…

Q: Can you please calculate the 95% confidence interval for this problem

A: From the obtained results, the mean of the difference is -2.1 and the standard deviation of the…

Q: Whenever an effect is significant, all values in the confidence interval will move in which…

A: The confidence level indicates the possibility that the confidence interval contains the population…

Q: A new drug for migraine headaches has been introduced to the market. You would like to know if…

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Q: Why do we need to compute a confidence interval rather than simply stating a point estimate

A: Whenever we discuss the estimation of an unknown parameter, there is a need for a confidence…

Q: You suspect minority students are not as supportive of the new principal of a large school because…

A: given n1=56, x1=45 n2=33, x2=21

Q: Exercise 19. Why are narrow confidence intervals better than wide ones? Discuss how n, o², and a…

A: Confidence intervals are used to estimate the range of values in which the true population parameter…

Q: What is a Confidence Level? what is one example of the use of the Confidence Interval?

A: A level of confidence refers to the percentage of all possible samples which the true population…

Q: What is the impact of increasing the confidence level for a confidence interval? Makes the interval…

A: We are assuming that all other things are constant.   Confidence Interval is range that contains all…

Q: You want to know about the difference in the percentage of men who get sick when exposed to H1N1 and…

A: Given data: For men: n1 = 150      x1 = 20 For Women: n2 = 200       x2 = 15 Confidence level = 95%…

Q: Let's say you survey a random sample of 70 people. You ask the people in your survey if they prefer…

A: given data  n = 70 p = 0.53 95% ci for p margin of error (E) = ?

Q: A researcher wanted to check whether the percentage of Canadian adults with obesity has decreased in…

A: Number of Canadian adults in 2005= 75 Number of Canadian adults in 2009 = 120   significance level =…

Q: What will happen other things being equal if you increase the confidence level for a given…

A: The objective of the question is to understand the impact of increasing the confidence level on the…

Q: If a 95% confidence interval contains 0, so will the 99% confidence interval. True False3

A: Solution: As the confidence level increases the margin of error increases. This leads to the…

Q: he lower end of the 95% confidence interval is Question Blank 1 of 2and the higher end of the 95%…

A: n=8 Sample sizex= 9.8 Sample mean s= 0.4 Sample standard deviation

Q: Determine from a confidence interval whether a test is significant?

A: Null hypothesis states that there is no difference between populations or a set of given…

Q: The La Leche Society has released an educational video on the benefits of breast feeding. Prior to…

A: In statistical inference, there are two types of estimation,  Point estimation and Interval…

Q: What can we do to make a confidence interval narrower without changing the confidence level?

A: Confidence interval:  A range of values such that the population parameter can expected to contain…

Q: I know how to do the first part, I am curious how to get the 95% confidence interval on part 6.

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Q: In a random and independent sample of 4000 students 35% of them were in favor of more online courses…

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Q: if for some reason it was not possible to obtain the 99% confidence interval from SPSS, how could…

A: Given information: Confidence level=99%=0.99α=1%=0.01

Q: how would i do 19 b with a 95% confidence interval***** not 90%

A: Given Information B) Sample Mean(M) = 77.2 Sample Standard Deviation = 5.7 Sample size(n) = 9…

Q: Is this correct or incorrect? Why?

A: Here use basic of confidence interval

Q: A scientist claims that 65% of U.S. adults believe humans contribute to an increase in global…

A: Given  A scientist claims that 65% of U.S. adults believe humans contribute to an increase in global…

Q: Why is a 99% confidence interval wider than a 95% confidence interval?

A: The confidence interval formula is sample statistic±Margin of error. The margin of error is the…

Q: What effect does increasing the sample size have on the width of a confidence interval? I know that…

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Q: What are confidence intervals?

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Q: What is the difference between a prediction interval and a confidence​ interval? And when is it…

A: Confidence Interval :  Confidence intervals tell you how well you have determined a parameter of…

Q: In general, would you expect a 90% confidence interval on μ to be longer or shorter than a 95%…

A: Given It is given that the sample is same and CL is increased from 90% to 95%.

Q: What is the difference between the different confidence interval formulas?

A: Confidence interval is the estimate of the interval of an unknown population parameter. It provides…

Q: The first day of baseball comes in late March, ending in October with the World Series. Does fan…

A: From the provided information,Confidence level = 99%

Q: What is the correct answer? The change in confidence level (increase, decrease, does not change,…

A: We want to tell you which one is the correct choice

Q: Sleep apnea: Sleep apnea is a disorder in which there are pauses in breathing during sleep. People…

A: Let X be the number of people 65 and over who have sleep apnea.X= 115  n= 421level of significance…

Q: A 99% confidence interval is smaller in size than a 95% confidence interval because it is more…

A: Given  A true or false question based on confidence interval.