B. Find the critical value za that corresponds to the given confidence level.
Q: Use the given data to construct a 98%confidence interval for the population proportion p x = 52 , n…
A: We have given that, Favorable cases (X) = 52 and sample size (n) = 69 Then, We will find the 98%…
Q: If n = 100 and p (p-hat) = 0.9, construct a 95% confidence %3D interval. Give your answers to three…
A: Givensample size(n)=100p^=0.9α=1-0.95=0.05α2=0.025zc=zα2=z0.025=1.96 (from z table)
Q: If n=30, ¯xx¯(x-bar)=43, and s=16, construct a confidence interval at a 98% confidence level. Assume…
A:
Q: If n = 10, ¯xx¯ = 43, and s = 8, construct a confidence interval at a 90% confidence level. Assume…
A: Since population standard deviation is unknown, Use t-distribution to find t-critical value. Find…
Q: Find the value of the sample size needed if the confidence interval is 95% that the sample…
A: Given that Margin of error =E =0.04 Sample proportion p^=0.45
Q: A university financial aid office polled a random sample of 467 male undergraduate students and 574…
A: Confidence interval: The (1-α)100 % confidence interval for proportion p1 – p2 is given by,…
Q: If n=16, ¯xx¯(x-bar)=46, and s=12, construct a confidence interval at a 95% confidence level. Assume…
A: Given n=16 x=46 s=12 CL=95% Data is normally distributed
Q: Construct a 95% confidence interval for the proportion of adults from the East who say traffic…
A: n = 400 p = 0.34
Q: 1. We are interested in determining if absences from a class affect your overall class grade. The…
A: Hey, since there are multiple subparts posted, we will answer first three subparts. If you want any…
Q: A random sample of size n₁ = 23, taken from a normal population with a standard deviation 01 = 6,…
A: Hey there! Thank you for posting the question. Since there are multiple questions posted, we will…
Q: If n=15, ¯xx¯(x-bar)=30, and s=2, construct a confidence interval at a 98% confidence level. Assume…
A: Given Sample size n = 15 degree of freedom = n-1 =14 x the level of confidence interval 98 %…
Q: If n = 22, ¯xx¯ = 36, and s = 14, construct a confidence interval at a 98% confidence level. Assume…
A: From the provided information, Sample size (n) = 22 Sample mean (x̄) = 36 Standard deviation (s) =…
Q: Using the data provided 1. find the confidence interval 2. find the error bound
A:
Q: construct a confidence interval at a 98% confidence level.
A: Given : n=29 , X-bar=39 , s=11 , α=0.02 Since , the population standard deviation (σ) is unknown.…
Q: find the point estimate for the mean and the margin of error. Give your answers precise to two…
A: Given Data Lower limit = 1.97 upper limit = 2.93
Q: When a 95% confidence interval is calculated instead of a 99% confidence interval with n being the…
A: From the provided information, 95% confidence interval is calculated instead of a 99% confidence…
Q: If n=22, ¯xx¯(x-bar)=46, and s=8, construct a confidence interval at a 98% confidence level. Assume…
A: It is given that mean and standard deviation are 46 and 8, respectively.
Q: In one community, a random sample of 25 foreclosed homes sold for an average of $443,776 with a…
A: From the provided information,Standard deviation (s) = 196739Sample mean (x̄) = 443776Sample size…
Q: If n = 25, ¯x = 50, and s = 19, construct a confidence interval at a 99% confidence level. Assume…
A:
Q: Find the critical value z needed to construct a confidence interval with level 97%. Round the answer…
A: Given: Confidence level = 97% = 0.97 Significance level = 1-0.97 = 0.03 Zα/2 = Z0.03/2= Z0.015=…
Q: Which of the following would result in the narrowest confidence interval? A. 80% confidence level…
A: The narrowest confidence interval will result from larger sample size and a smaller confidence…
Q: n=31, ¯xx¯(x-bar)=30, and s=5, construct a confidence interval at a 98% confidence level. Assume the…
A:
Q: A history teacher records the SAT scores of all 87 of her students. The data is used to construct a…
A: For calculating the confidence interval, we need to satisfy the following conditions: Independence…
Q: A researcher is interested in a 95% confidence interval. It is found to have a point estimate of 2.5…
A: From the provided information, Confidence level = 95% Point estimate = 2.5 Margin of error (E) = 0.6
Q: If n = 15, ¯x = 50, and s = 9, construct a confidence interval at a 90% confidence level. Assume the…
A:
Q: Suppose that you will be taking a random sample from a population and that you intend to find a 95%…
A: Solution: The confidence interval for the population mean is calculated by using the following…
Q: Give the critical value, za/2 , for the 98% confidence level. A.) 2.33 B.) 1.645 C.) 2.575 D.) 1.96
A: For 98% CI
Q: If n=12, x=47, and s=7, construct a confidence interval at a 98% confidence level. Assume the data…
A: According to the provided information,
Q: A human resource manager wants to see if there is a difference in the proportion of minority…
A: Confidence Interval: Confidence interval is the interval estimate of the population parameter. It is…
Q: If n=13, ¯x(x-bar)=44, and s=3, construct a confidence interval at a 99% confidence level. Assume…
A: Here, n is 13, x-bar is 44, and s is 3. Critical value: Using Excel formula…
Q: If n=15, ¯xx¯(x-bar)=40, and s=9, construct a confidence interval at a 98% confidence level. Assume…
A:
Q: e) Find the critical value used to construct a 80% Confidence Interval for the mean. Only for this…
A: Solution: e. From the given information, the population standard deviation is σ=23.8 is known. The…
Q: Please also solve for A.CRITICAL VALUE B.MARGIN OF ERROR C.LOWER LIMIT D.UPPER LIMIT E.SOLUTION SET…
A: The sample mean is 150.
Q: Which of the following is the best estimate of the range of a population value given the sample…
A: Confidence interval is known as the probability that a population parameter will lie between a set…
Q: c. All else being equal, find a 95% confidence interval for the percentage increase in…
A: Given data : Sample n = 2226 R2 = 0.187 SF = 0.0527 i = 1.1532 Confidence interval = 95% No of…
Q: If n = 15, ¯xx¯ = 43, and s = 11, construct a confidence interval at a 98% confidence level. Assume…
A: Given that, The degree of freedom is, Critical values: The t-critical values for a two-tailed…
Q: If n = 530 and X = 424, construct a 99% confidence interval for the population proportion, p. Give…
A:
Q: Determine the point estimate of the population mean and margin of error for the confidence interval…
A: The lower bound of the confidence interval is 14 and the upper bound of the confidence interval is…
Q: Suppose that you will be taking a random sample from a population and that you intend to find a 95%…
A: If the sample size increases, then the standard error of statistic decreases. The margin of error is…
Q: If the number of smokers in a sample of 160 students selected from university A is 56 and the number…
A: From the provided information,
Q: If n=28, ¯x(x-bar)=32, and s=11, construct a confidence interval at a 95% confidence level. Assume…
A:
Q: If n=29, x¯=48, and s=13, construct a confidence interval at a 90% confidence level. Assume the data…
A: The confidence level is 90%. Then the probability is 10%=100%-90%. The degrees of freedom is,…
Q: Part A: Construct and interpret a 95% confidence interval for the difference in population…
A: Let is the difference between population proportions of females and males who have an after-school…
Q: Determine the equation of the regression equation, reporting each to 3 decimal places. A. Slope is…
A: Note: According to Bartleby expert guidelines, we can answer only first question with their three…
Step by step
Solved in 2 steps with 2 images
- d) Construct a 90% confidence interval for Hcommunity college - Hno transfer to approximate the mean additional time it takes to complete a bachelor's degree if you begin in community college. The confidence interval is the range from to (Round to three decimal places as needed.)If n=29, x¯(x-bar)=31, and s=8, construct a confidence interval at a 90% confidence level. Assume the data came from a normally distributed population.Give your answers to one decimal place.A sample of 100 shoppers chosen at random from all shoppers in a given province indicated that 55% of them preferred a particular store (Shoprite).i. Find a 95% confidence interval for the proportion of all the shoppers that preferred Shoprite.ii. How large a sample of shoppers should we take in order to be 95% confident that the shoppers will buy from Shoprite?
- When a population has less variability, for the same margin of error and confidence level, the confidence interval becomes a. larger b. smaller c. of unchanged sizeRefer to the accompanying data set of mean drive-through service times at dinner in seconds at 2 fast food restaurants. Construct a 90% confidence interval estimate of the mean drive-through service time for restaurant x at dinner then do the same for a restaurant y Compare the results.A research center survey of 2,484 adults found that 1,942 had bought something online. Of these online shoppers, 1,295 are weekly online shoppers. Complete parts (a) through (c) below. a. Construct a 95% confidence interval estimate of the population proportion of adults who had bought something online. Sas (Round to four decimal places as needed.) led b. Construct a 95% confidence interval estimate of the population proportion of online shoppers who are weekly online shoppers. Sas (Round to four decimal places as needed.) c. How would the director of e-commerce sales for a company use the results of (a) and (b)? O A. Since a greater proportion of adults have purchased something online than are weekly online shoppers, the director of e-commerce sales may want to focus on those adults who have purchased something online. led O B. The information cannot be compared because it is derived from two different opinions. O C. Agreater proportion of adults have purchased something online, but…
- Echinacea is widely used as an herbal remedy for the common cold, but does it work? In a double-blind experiment, healthy volunteers agreed to be exposed to common-cold-causing rhinovirus type 39 and have their symptoms monitored. The volunteers were randomly assigned to take either a placebo or an echinacea supplement daily for 5 days following viral exposure. Among the 103 subjects taking a placebo, 88 developed a cold, whereas 44 of the 48 subjects taking echinacea 1 developed a cold.If n=14, ¯xx¯(x-bar)=34, and s=4, construct a confidence interval at a 80% confidence level. Assume the data came from a normally distributed population.In order for a prediction interval for y or a confidence interval for Hyx to be valid, which of the following must hold? a. The true relationship between the predictor variable x and the response variable y must be close to linear. b. The variability of the x-values must be about the same at each fixed y value. c. The variability of the y-values must be about the same at each fixed x value. d. The variability of the x-values and the y-values must be about the same. Select one answer A (c) and (d) must hold B (a) and (b) must hold (b) and (d) must hold D) (a) and (c) must hold
- If n=16, x¯(x-bar)=48, and s=7, construct a confidence interval at a 98% confidence level. Assume the data came from a normally distributed population.Give your answers to one decimal place.Assume that the 95% confidence interval for mean=9 and standard devaition=20. For a particular data, the standardized value z = 2.73. We can say that: Select one: a. The data with standardized value 2.73 does not belong to the confidence interval and the value is less than the average. b. The data with standardized value 2.73 does not belong to the confidence interval and the value is greater than the average. c. Cannot interpret the z-value information provided. d. The data with standardized value 2.73 if it belongs to the confidence interval and the value is less than the average. e. The data with standardized value 2.73 if it belongs to the confidence interval and the value is greater than the average.The confidence level is 99% , o= 4178 thousand dollars, and the histogram of 59 player salaries of football players. Find the critical value za/2 and ta/2