a. Construct a 95% confidence interval. Express the percentages in decimal form.
Q: d the sample size needed to estimate the percentage of adults who can wiggle their ears. Use a…
A: Margin of error E=4%=0.04C.I=95%=0.95
Q: Use the given confidence interval to find the margin of error and the sample mean. .734, .760
A: From the given information, the confidence interval is (0.734, 0.760). It can be expressed in,
Q: 2. Marta has constructed three confidence intervals for a population mean using the same sample for…
A: A confidence interval estimate is an interval estimate that includes the unknown population…
Q: If you increase the confidence level, the confidence interval A. Gets wider B. gets narrower C.…
A: We know that-The confidence interval is given byHere, x¯ = sample meanσ = population standard…
Q: A poll reported that only 408 out of a total of 1549 adults in a particular region said they had a…
A: (a) Obtain the 95% confidence interval for the proportion that express a great deal or quite a lot…
Q: n a survey of Construct a 95% confidence interval for the population proportion of adults who…
A:
Q: Use the sample data and confidence level given below to complete parts (c). A research institute…
A: It is given that, the number of respondents said yes (x) is 587 and the sample size (n) is 912. The…
Q: standard deviation is $17.40.
A: We have given that Sample size n =55 Sample mean =136 Standard deviation =17.40
Q: In a survey of 3352 adults, 1435 say they have started paying bills online in the last year.…
A: From the provided information, Sample size (n) = 3352 From which 1435 say they have started paying…
Q: The next five questions refer to the following scenario: 10 sample mean x • sample sizen = 100…
A:
Q: Use the given degree of confidence and sample data to construct a confidence interval for the…
A: Given, Total size n = 140 No of ppl smoke x = 35 proportion p = xn = 35140 = 0.25 99% confidence…
Q: In a survey of 2326 adults, 704 say they believe in UFOs. Construct a 99% confidence interval for…
A: sample size(n)=2326No. of adults say they believe in UFOs=704confidence level=99%
Q: A. Find the confidence intervals for the population mean from the given data. 1. x = 5.8, n = 36, o…
A: as per Bartleby guideline expert have to answer first question only dear students please upload…
Q: Plz help asap 5…
A: we can use the formula:where: CI = Confidence interval p̂ = Sample proportion Z = Z-score…
Q: Two researchers drew samples to estimate the same population. Here are the confidence intervals they…
A: a. The confidence interval A is, (0.52, 0.58).
Q: Find the sample size needed to estimate the percentage of adults who can wiggle their ears. Use a…
A: given data, E= 2%CI=0.90α=1-0.90=0.10for 90% CI, z-critical value:Zc:=Z0.10/2=Z0.05=1.645 [ from…
Q: Use the given degree of confidence and sample data to construct a confidence interval for the…
A:
Q: In a survey of 2587 adults in a recent year, 1241 say they have made a New Year's resolution.…
A: From the provided information Sample size (n) = 2587 1241 say they have made a New Year's…
Q: In a survey of 2285 adults, 750 say they believe in UFOS. Construct a 99% confidence interval for…
A: Given,n=2285X=750p^=Xnp^=7502285=0.3281-p^=1-0.328=0.672α=1-0.99=0.01α2=0.005Z0.005 =2.58
Q: Use the given data to construct a confidence interval for the population proportion p of the…
A: From the provided information,x = 49, n = 68, confidence level = 99.5%p̂ = 49/68 = 0.696
Q: Interval. A researcher wants to estimate the mean cholesterol level of people in his city. A random…
A: we have given that n=21 , xbar=219 and margin of error =±12
Q: Use the given degree of confidence and sample data to construct a confidence interval for the…
A: Given,n=130X=69p^=Xnp^=69130=0.5311-p^=1-0.531=0.469α=1-0.99=0.01α2=0.005Z0.005=2.576 (from…
Q: A psychologist is interested in constructing a 99% confidence interval for the proportion of people…
A: From the provided information,Confidence level = 99%
Q: In a survey of 2362 adults in a recent year, 1385 say they have made a New Year's resolution.…
A: Solution: Let X be the number of adults say they have made a New Year’s resolutions and n be the…
Q: A psychologist is interested in constructing a 99% confidence interval for the proportion of people…
A: The formula for the confidence interval for the proportion is,
Q: which of the following are ways in which we can report a confidence interval? A. lower boundary,…
A: Confidence interval C.I= Point estimate +- Margin of error(ME) Confidence interval C.I=( lower…
Q: Find the sample size needed to estimate the percentage of adults who can wiggle their ears. Use a…
A: Margin of error(E)=4%=0.04confidence level=99%
Q: In a survey of 2009 adults in a recent year, 1263 say they have made a New Year's resolution.…
A:
Q: Help please :)
A: The confidence interval for population proportion is given by p^-M, p^+M, where p^ represents the…
Q: 6. Explain what this confidence interval means to your boss, who has never taken a statistics class.…
A: What is confidence interval and explain it to non statistics person.
Q: Which of the following statements is TRUE? O a The larger the size of the sample, the greater is the…
A: 1) Sample size and confidence interval relation. We know that Confidence interval (CI) = x¯±Zcxσn…
Q: Determine the t score used for each confidence interval. A. n= 6 and 95% confidence B. n = 14 and…
A: (A) Obtain the t-score of the 95% confidence interval for n=6. The t-score of the 95% confidence…
Q: In a survey of 2273 adults, 709 say they believe in UFOs. Construct a 95% confidence interval for…
A: Answer:- Given, Sample size, n = 2273 Number of successes on sample, x = 709Confidence level, C =…
Q: In a survey of 2268 adults in a recent year, 1423 say they have made a New Year's resolution.…
A: For the given data Find confidence interval
Q: In a survey of 3089 adults aged 57 through 85 years, it was found that 88.5% of them used at least…
A:
Q: Decreasing the sample size while the confidence level remains the same, will do what to the length…
A:
Q: Assume that the following samples are independent. In a random sample of 400 women, 47% favored…
A: Obtain the 98% confidence interval for the difference between the population proportions. The 98%…
Q: A psychologist is interested in constructing a 99% confidence interval for the proportion of people…
A: From the provided information,Confidence level = 99%
Q: 1. A university health services physician is concerned about how much sleep freshman are getting.…
A: since parameter is proportion here, we use one same proportion confidence interval.
Q: ou are interested in constructing a 95% confidence interval for the proportion of all caterpillars…
A: Solution: Given information: n= 409 Sample size of caterpillars x= 58 caterpillars become…
Q: Which of the following statements is correct about confidence intervals?
A: (A) Incorrect Since, on increasing the confidence level, the error bound increases. As one has to…
Q: Problem: Use the data given in Example #1 to construct a 95% confidence interval for the mean number…
A: Given data:
Q: It is possible all of these intervals are in- correct. For example, if v = 100 then ev- ery interval…
A:
Q: In a survey of 2295 adults, 746 say they believe in UFOs. Construct a 90% confidence interval for…
A: Proportion is almost similar to the concept of probability. Proportion is a fraction of population…
Q: Assume that the population has a normal distribution. use a 95% Confidence level. In a survey of…
A: Note: Since its not mentioned which parts has to be done. We are hereby doing only first three…
Q: p and q are unknown. me nearest integer.) 25% of adults can wiggle their ears. me nearest integer.)…
A: Given that Margin of error =E=3% E=0.03
Step by step
Solved in 2 steps with 2 images
- Find the sample size needed to estimate the percentage of adults who can wiggle their ears. Use a margin of error of 3 percentage points and use a confidence level of 90%. Complete parts (a) and (b) below. a. Assume that p and q are unknown. n= (Round up to the nearest integer.)You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. If convenient, use technology to construct the confidence intervals. A random sample of 35 home theater systems has a mean price of $144.00. Assume the population standard deviation is $15.70. Construct a 90% confidence interval for the population mean. The 90% confidence interval is (.). (Round to two decimal places as needed.) Construct a 95% confidence interval for the population mean. The 95% confidence interval is (.). (Round to two decimal places as needed.) Interpret the results. Choose the correct answer below.We wish to estimate what percent of adult residents in a certain county are parents. Out of 600 adult residents sampled, 150 had kids. Based on this, construct a 90% confidence interval for the proportion p of adult residents who are parents in this county. Express your answer in tri-inequality form. Give your answers as decimals, to three places. p Express the same answer using the point estimate and margin of error. Give your answers as decimals, to three places. K P= Submit Question
- From the data plot provided please answer the following questions.In a survey of 2254 adults, 716 say they believe in UFOs. Construct a 95% confidence interval for the population proportion of adults who believe in UFOs. A 95% confidence interval for the population proportion is (Round to three decimal places as needed.) Interpret your results. Choose the correct answer below. O A. The endpoints of the given confidence interval shows that 95% of adults believe in UFOs. OB. With 95% confidence, it can be said that the population proportion of adults who believe in UFOs is between the endpoints of the given confidence interval. OC. With 95% confidence, it can be said that the sample proportion of adults who believe in UFOs is between the endpoints of the given confidence interval. O D. With 95% probability, the population proportion of adults who do not believe in UFOs is between the endpoints of the given confidence interval. # 3 e d C с $ 4 F f 25 % V t bo 6 b y 30 & 7 h O n u j * 8 m 9 k ✓ Time Remaining: 00:50:41 :) 0 Р Next + 11 ?A confidence interval for a population mean has a margin of error of 2.2. a. Determine the length of the confidence interval. b. If the sample mean is 52.7, obtain the confidence interval. c. Construct a graph that illustrates your results. a. The length of the confidence interval is. (Type an integer or a decimal. Do not round.) b. The confidence interval for μ is from to. (Type integers or decimals. Do not round.) c. Choose the correct graph below. O A. O C. 48 Confidence Interval CI M G -C... O B. O D. CI H Confidence Interval EE 55 Q G B
- A survey asked, "How many tattoos do you currently have on your body?" Of the 1233 males surveyed, 183 responded that they had at least one tattoo. Of the 1042 females surveyed, 139 responded that they had at least one tattoo. Construct a 95% confidence interval to judge whether the proportion of males that have at least one tattoo differs significantly from the proportion of females that have at least one tattoo. Interpret the interval. C Let p₁ represent the proportion of males with tattoos and p2 represent the proportion of females with tattoos. Find the 95% confidence interval for p₁ -P2- The lower bound is The upper bound is (Round to three decimal places as needed.)ok In a survey of 2279 adults, 720 say they believe in UFOs. Construct a 95% confidence interval for the population proportion of adults who believe in UFOs. A 95% confidence interval for the population proportion is (Round to three decimal places as needed.) Interpret your results. Choose the correct answer below. R OA. With 95% confidence, it can be said that the population proportion of adults who believe in UFOs is between the endpoints of the given confidence interval. OB. With 95% probability, the population proportion of adults who do not believe in UFOs is between the endpoints of the given confidence interval. OC. With 95% confidence, it can be said that the sample proportion of adults who believe in UFOs is between the endpoints of V C ◎可 F5 J % 250 T F6 دار 6 & X F7 & 7 N 8 F8 J 00 * 8 8 F9 M 09 9 K F10 O V 70°F Sunny A ☀- F11 O Alt ☀ P + F12 ^ Next 1:23 PM 11/23/2022 PrtSc CM +11 InseYou are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. From a random sample of 74 dates, the mean record high daily temperature in a certain city has a mean of 82.58° F. Assume the population standard deviation is 14.82°F. The 90% confidence interval is (Round to two decimal places as needed.) The 95% confidence interval is ( I). (Round to two decimal places as needed.) Which interval is wider? Choose the correct answer below. The 95% confidence interval The 90% confidence interval