What is the 95% Confidence Interval for a security which has an average rate of return of 18.63% and a standard deviation of 38.34%?

Q: Wildlife biologists inspect 200 deer taken by hunters and find 45 of them carrying Lyme disease…

A:

Q: You take a sample (N = 25) of test scores from a population. The sample mean is 38, and the…

A: The confidence level is 95%. The area between -Zα/2 and Zα/2 is 0.95. Since the normal distribution…

Q: Number of Jobs A sociologist found that in a sample of 50 retired men, the average number of jobs…

A: Given,sample size(n)=50sample mean(x¯)=6.9standard deviation(σ)=2.3

Q: Find the value of ta/2 given a. n = 37 for the 85% confidence interval for the mean b. n = 15 for…

A: a)Here,α=1-85%=1-0.85=0.15 And,The degree of freedom=n-1=37-1=36   Then, from the…

Q: A new post-surgical treatment is being compared with a standard treatment. Seven subjects receive…

A: The given data for the recovery times of sampled subjects is given as…

Q: Confidence Intervals

A: Given : Maximum breadth of samples of male Egyptian skulls from 4000 B.C. and 150 A.D. . Changes in…

Q: Give a real life example of how confidence intervals are used.

A: Solution-: We want to get a real life example of how confidence intervals are used.

Q: A magazine provided results from a poll of 2000 adults who were asked to identify their favorite…

A: Confidence level: 1-α100%=Confidence level

Q: In a survey, 32 people were asked how much they spent on their child's last birthday gift. The…

A: From the provided information, Sample size (n) = 32 Sample mean (x̄) = 40.2 Sample standard…

Q: Investor A wants to maximize his expected return by investing some proportion in Stock Z which has…

A: Expected rate of return = 18% Standard deviation max = 25% Standard deviation of Z = 21%

Q: Explani a confidence interval.

A: We will explain confidence interval = ?

Q: Illustrate the formula for the confidence interval?

A: confidence interval is defined as a range of values so defined that there is a specified probability…

Q: How do you interpret the confidence interval. Select all that apply. We are 95% confident that the…

A: Solution: Given that, sample size n=15, sample mean x¯=0.287 and standard deviation s=0.069 then…

Q: Continuing the last question: An accountant wants to know the mean time to prepare a tax return.…

A: Given,sample size(n)=20sample mean(x¯)=2.67standard deviation(s)=0.95degrees of…

Q: Consider the Sample mean, Xn. as an estimator of population mean, l. The Cenfal Lmit Theorem tells…

A:

Q: Announcements for 81 upcoming engineering conferences were randomly picked from a stack of IEEE…

A: Confidence interval are used to determine the range where the true value of the parameter lies. It…

Q: 1. How do you solve confidence intervals? 2. What do Confidence intervals tell us?

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: A simple random sample of size n is drawn from a population that is normally distributed. The sample…

A: Given, x=106s=10 a) For n=26 and α=1-0.98=0.02 The degrees of freedom is obtained as- df=n-1=26-1=25…

Q: give examples about point estimation (confidence interval)

A: Example on the basis of Point estimation

Q: What do Confidence intervals tell us

A: Confidence interval

Q: the women were found to have Type 2 diabetes. What is the upper bound of a 95% confidence level for…

A:

Q: Confidence Intervals: Generate the specified confidence interval. Karen wants to advertise how many…

A: Given that the sample size is n=100  The sample mean is X¯=12.9 The standard deviation is s=3.4

Q: magine that you conduct a study and estimate that the prevalence of hypertension among employees of…

A: From the provided information, Sample proportion (p̂) = 0.24 Margin of error for a 95% confidence…

Q: Confidence intervals are designed to predict where the population mean will fall. We use the Z…

A: A confidence interval is an interval (corresponding to the kind of interval estimators) that has…

Q: whats a confidence interval?

A: Confidence intervals: Confidence intervals are the limits for the point estimate of population…

Q: is a confidence interval and how do we calculate it

A: Confidence interval: It is defined as the range which contains the value of true population…

Q: Data are used either to test a hypothesis or to construct a confidence interval, but not both.…

A: Confidence intervals and hypothesis tests are similar during this they're both inferential methods…

Q: How do I find confidence levels

A: The confidence level helps in deciding the size of the confidence interval . Also, it helps in…

Q: 2. What do Confidence intervals tell us?

A: Disclaimer: Since you have asked multiple questions, we will solve the first question for you. If…

Q: Assume that a sample is used to estimate a population proportion p. Find the 90% confidence interval…

A: The sample size The number of successes The confidence level

Q: A random survey of 705 elderly men, aged 70 and more, was taken and 14.6% were found to have Type 2…

A:

Q: The price of a share of stock divided by the company's estimated future earnings per share is called…

A: From given data, n=51 x=25.17 s=15.472

Q: Find the value of za/2 given a. 92% degree of confidence b. 98% degree of confidence

A: Given, Confidence level: a) 92% b)98%