How many voters should be sampled for a 99% confidence interval? Round up to the nearest whole number.
Q: The three confidence intervals to the right represent three samplings. Decide whether each…
A: Given: H0: μ≥71 a) Confidence interval = (69, 73)
Q: Use the confidence interval to find the margin of error and the sample mean. (1.52,2.06)
A: Given: Confidence interval is (1.52, 2.06) To determine: The margin error and The sample mean.…
Q: Use the confidence interval to find the margin of error and the sample mean. (1.71, 1.99)
A: Solution: Given data: confidence Interval = (1.71, 1.99) To find: 1.Margin of error 2. Sample mean…
Q: If n=470 andp (p-hat) =0.69, find the margin of error at a 95% confidence level Give your answer to…
A: If the number of possible observations from the total sample size is calculated using the proportion…
Q: If n=550 and ˆpp^ (p-hat) =0.25, find the margin of error at a 99% confidence level Give your…
A: The margin of error = The margin of error (ME) expresses to the maximum expected differences between…
Q: Construct a 99% confidence interval estimate for the population mean, N = 36, ?̅= 135, σ = 24
A: As the population standard deviation σ is not known, we will use z-distribution. The value of z at…
Q: An article in a newspaper states that the proportion of traffic accidents involving road rage is…
A: An article in a newspaper states that the proportion of traffic accidents involving road rage is…
Q: How do I calculate a 95% confidence level for a sample proportion in excel? Meaning, what formula…
A: Given : Confidence level = CL = 95% = 0.95
Q: If n = 590 and ˆp=0.48, find the margin of error at a 99% confidence level E=
A: If n = 590 and ˆp=0.48, find the margin of error at a 99% confidence level
Q: which statistic is equivalent to dividing the sum of scores equally across all members of a sample
A: The statistic measures the characteristics of samples to estimate the population.
Q: If n = 330 and X = 264, construct a 95% confidence interval for the population proportion, p.
A:
Q: If n=330 and p (p-hat) =0.92, find the margin of error at a 99% confidence level Give your answer to…
A:
Q: If n = 200 and p^ = 0.64, find the margin of error at a 95% confidence level.
A:
Q: Construct a 95% confidence interval of the population proportion using the given information.…
A:
Q: If n=160 and ˆp (p-hat) =0.48, find the margin of error at a 99% confidence level
A: Given Data: p^=0.48n=160 We know that, p^-pp^(1-p^)n~ Normal(0,1)
Q: A poll asked 800 people their choice for mayor. What is the approximate margin of error for a 95%…
A: Given: P=0.5 q=0.5 z-critical value for 95% confidence interval is 1.96. The approximate margin of…
Q: If n=450 and ˆpp^ (p-hat) =0.48, find the margin of error at a 99% confidence level Give your…
A: Given n=450 and p^=0.48, level of significance ɑ=0.01
Q: A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll,…
A: (a). Find the best point estimate of the population proportion p: It is given that, in a poll of n =…
Q: If n = 530 and X = 424, construct a 99% confidence interval for the population proportion, p. Give…
A: Given that, n = 530 x = 424 Point estimate = sample proportion = = x / n = 424 /530=0.8 1 - =…
Q: How large is the sample if the confidence level is 97%, Ɛ = 2.5% and ρ = .35?
A:
Q: What happens to the margin of error if you increase the confidence level?
A: We know that, Margin of error=zσn
Q: A television sports commentator wants to estimate the proportion of citizens who "follow…
A: Solution: From the given information, confidence level is 0.96, p=0.54 and E=0.02.
Q: A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll,…
A: Given , n = 1008 x = 598
Q: 2. A researcher wants to estimate the daily expenses of college students. He wants a 95% confidence…
A: We have given that, Population standard deviation (σ) = 99.50, margin of error (E) = 45 and…
Q: You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You…
A:
Q: The 90% confidence interval for the population proportion p is (,) The 95% confidence interval for…
A: here n = 634 p^ = proportion of males gone to dentist pin past year = 390634 = 0.6151 z-critical for…
Q: If n=130 and ôp (p-hat) =0.93, find the margin of error at a 99% confidence level Give your answer…
A: Here, the margin of error for proportion p^ is to be calculated. The formula is given by, z*p^1-p^n,…
Q: Use the confidence interval to find the margin of error and the sample mean. (0.676,0.800)
A: The margin of error is the most common term which we use in a confidence interval. It is the degree…
Q: In a previous election, the confidence interval for the proportion of likely voters who would vote…
A: given;confidence interval for the proportion;(0.4401, 0.5199)i.e. (p^-E, p^+E)where p^ : point…
Q: Suppose we want to estimate the proportion of teenagers (aged 13-18) who are lactose intolerant. If…
A: Given information Error = 3% = 0.03 Confidence level = 0.95
Q: If n=200 and ˆpp^ (p-hat) =0.39, find the margin of error at a 99% confidence level
A: Find z-critical value:…
Q: If Xbar=93, σ=13, and n=62, construct a 99% confidence interval estimate of the population…
A: Given that Sample size: n=62 Sample mean: x¯=93 Population standard deviation: σ=13 Confidence…
Q: What must be true about the sampling method and the values of p, q, and n in order to construct a…
A: For constructing Confidence interval for proportion, following assumptions need to be care
Q: answer
A: Given: Population proportion, p = 0.25 Margin of error, E = 0.06 Confidence interval = 95% Then, by…
Q: A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll,…
A:
Q: If n=14, (x-bar)-33, and s=9, find the margin of error at a 98% confidence level Give your answer to…
A: We have given that, Sample mean (x̄) = 33, standard deviation (s)= 9 and sample size (n) = 14 Then,…
Q: If n=570 and ˆpp^ (p-hat) =0.51, find the margin of error at a 95% confidence level Give your…
A: n = 570 p^=0.51 95% confidence level
Q: If n= 220, p-hat= .4, then what will be the 87.4% confidence interval for the population proportion?
A:
Q: If n=490 and ˆpp^ (p-hat) =0.46, find the margin of error at a 99% confidence level.Give your answer…
A:
Q: Use the confidence interval to find the margin of error and the sample mean. (1.59,1.89)
A: Given data,Lower limit=1.59Upper limit=1.89Margin of error=?
Q: 3. Aresearcher wants to estimate the daily expenses of college students. He wants a 99% confidence…
A:
Q: Out of 400 people sampled, 260 preferred Candidate A. Based on this estimate, what proportion (as a…
A: Given info: Out of 400 people sampled, 260 preferred Candidate A. Based on this estimate, the…
Q: A public opinion pollster wants to estimate the percentage of voters who favor an upcoming proposal.…
A:
Q: 19) A political survey had a margin of error of 4.25%. If the surveyor used a 90% confidence level…
A: Assume p-hat as 0.5, since no preliminary estimate is available.
Q: A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll,…
A: Given data n=1026 x=520 confidence interval=95%
Q: In a survey of 1037 US adults ages 65 and over, 643 were concerned about getting the flu. A 99%…
A:
Q: If n=380 and p (p-hat) =0.49, find the margin of error at a 99% confidence level Give your answer to…
A: Answer - If n = 380, P^ = 0.49 99% confidence interval ⇒ α =1 - 0.99 =…
Q: if n = 42, p = 0.6 then construct the 98% confidence interval for the population proportion.
A:
Q: If n=350 and p (p-hat) =0.28, find the margin of error at a 99% confidence level Give your answer to…
A: n = 350p^ = 0.2899% confidence level
Q: A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll,…
A: Given, The sample proportion is,
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- 9.13) The breaking strength of threads has a standard deviation of 18 grams. How many measures of breaking strength should be used in the next experiment if the estimate of the mean breaking strength is to be within 4 grams of the true mean breaking strength, with a confidence coefficient of 0.90?A random sample of 16 adult male wolves from the Canadian Northwest Territories gave an average weight x1 = 97 lb with estimated sample standard deviation s1 = 6.3 lb. Another sample of 22 adult male wolves from Alaska gave an average weight x2 = 88 lb with estimated sample standard deviation s2 = 7.1 lb. (a) Let ?1 represent the population mean weight of adult male wolves from the Northwest Territories, and let ?2 represent the population mean weight of adult male wolves from Alaska. Find a 75% confidence interval for ?1 – ?2. (Round your answers to one decimal place.) lower limit upper limit (b) Examine the confidence interval and explain what it means in the context of this problem. Does the interval consist of numbers that are all positive? all negative? of different signs? At the 75% level of confidence, does it appear that the average weight of adult male wolves from the Northwest Territories is greater than that of the Alaska wolves? Because the interval…An article reported that for a sample of 44 kitchens with gas cooking appliances monitored during a one-week period, the sample mean CO2 level (ppm) was 654.16, and the sample standard deviation was 163.02. (b) Suppose the investigators had made a rough guess of 182 for the value of s before collecting data. What sample size would be necessary to obtain an interval width of 60 ppm for a confidence level of 95%? (Round your answer up to the nearest whole number.)
- What price do farmers get for their seedless watermelon crops? In a recent month, a simple random sample of 31 farming regions gave a sample mean of $12.15 per 100 pounds of seedless watermelon. Assumer that σ=$1.46 per 100 pounds. Find the sample size necessary for a 90% confidence level with a margin of error E=0.61 for the mean price per 100 pounds of seedless watermelon. (Increase to the next whole number.)Suppose the heights of a population of male giraffes are normally distributed with an unknown population mean and a population standard deviation of 3.4 feet. A random sample of male giraffes from the population produces a sample mean height of x¯=15.2 feet. What value of z should be used to calculate a confidence interval with a 90% confidence level? z0.10 z0.05 z0.025 z0.01 z0.005 1.282 1.645 1.960 2.326 2.576An article reported that for a sample of 42 kitchens with gas cooking appliances monitored during a one-week period, the sample mean CO2 level (ppm) was 654.16, and the sample standard deviation was 164.38. (a) Calculate and interpret a 95% (two-sided) confidence interval for true average CO2 level in the population of all homes from which the sample was selected. (Round your answers to two decimal places.) (b) Suppose the investigators had made a rough guess of 179 for the value of s before collecting data. What sample size would be necessary to obtain an interval width of 53 ppm for a confidence level of 95%? (Round your answer up to the nearest whole number.)
- Consider the following questions about CIs (Confidence intervals). A researcher tests emotional intelligence (EI) for a random sample of children selected from a population of all students who are enrolled in a school for gifted children. The researcher wants to estimate the mean emotional intelligence EI for the entire school. The population standard deviation, , for EI is not known. Let’s suppose that a researcher wants to set up a 95% (Confidence intervals) CI for IQ scores using the following information: The sample mean M = 130. The sample standard deviation s = 15. The sample size N =120. The (degree of freedom) df = N – 1 = 119. pg 87 df = 120 – 1 = 119 df = 119 For the values given above, the limits of the 95% CI are as follows: Lower limit = 130 – 1.96 x 1.37 = 127.31; Upper limit = 130 + 1.96 x 1.37 = 132.69. The following exercises ask you to experiment to see how changing some of the values involved in computing the CI influences the width of the CI. Recalculate the CI…Suppose the heights of a population of men are normally distributed with an unknown population mean and a population standard deviation of 2.4 inches. A random sample of men from the population produces a sample mean height of x ¯ =68.2 inches. What value of z should be used to calculate a confidence interval with a 90% confidence level? z 0.10 z 0.05 z 0.025 z 0.01 z 0.005 1.282 1.645 1.960 2.326 2.576A 30 month study is conducted to determine the difference in rates of accidents per month between two departments in an assembly plant. If a sample of 12 from the first department averaged 12.3 accidents per month with a standard deviation of 3.5, and a sample of 9 from the second department averaged 7.6 accidents per month with standard deviation of 3.4, find: The t-value for a 95% confidence interval is: A. 2.09302 B. 1.724718 C. 2.08596 D. 1.729133 E. none of the preceding
- A confidence interval for the difference between the means of two normally distributed populations based on the following dependent samples is desired: Before After 6 8 12 14 8 9 10 13 6 7a. Find the margin of error for a 90% confidence level. b. Find the UCL and the LCL for a 90% confidence level. c. Find the width of a 95% confidence interval.Given a sample mean of xbar=27 and a population standard deviation of σ=3.5 from a previous study where n=16 values, find the z value and p value. The data indicates that the population mean for the speed of a Belgian Malinois is µ=30 mph, but we think it may be higher based on our data. Test the claim that µ<30 with alpha value of a=0.05.R&D department believes that the C-type batteries with a nominal diameter of 2mm will fit properly into all toys. A tolerance variation of 0.000225mm2 is allowable. A machine produces a batch of 12 C-type batteries and the following diameters in mm is recorded. 26.22 26.19 26.24 26.21 26.16 26.18 26.21 26.20 26.22 26.19 26.20 26.18 i) Construct a 95% confidence interval for the population ii) Does this variation appear acceptable?