With 95% confidence, calculate the margin of error to estimate the population mean with a simple random sample of 8 items in a sample standard deviation of 3.5.
Q: 3. A simple random sample of 36 items resulted in a sample mean of 60 and a standard deviation of…
A: Given Sample size (n) = 36 Sample mean (x_bar) = 60 Sample standard deviation (S.e) = 12 We have to…
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A: Formula for calculating confidence interval is Confidence Interval=p∧±z*p∧(1-p∧)n
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A: a. The point estimate of the population mean is 6.9
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A: Dear Student, as you have posted multiple questions but we can attempt only 1 question at a time…
Q: 6. Western Trucking Company has 42 vehicles in its fleet. To estimate the average mileage in its…
A: Given: Sample size 6 Mean 57393 Standard deviation 12300 Confidence level 0.99
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A: we have formula for margin of error = Z@/2 * standard deviation/sq(n) we have n=250, Z@/2 = 1.645
Q: A sample of 81 observations is taken from a normal population with a standard deviation of 6. The…
A: A sample of n= 81 observations is taken from a normal population with a σ =6, Sample mean of X̅=41…
Q: As the sample size increases, the variance of the sample mean
A: Variance of sample mean is related to sample size.
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A: *ANSWER : * the given information as follows: sample size = n = 100 population standrd…
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A: Confidence interval for population proportion at 95% level P∧ ± Z0.95p∧q∧n…
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A: Since you have asked multiple questions, we will solve the first question for you. If you want any…
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A: (i) Given: Registered Voters (n)=175 % voted in election (p)= 54% Confidence interval =95%
Q: What are the Confidence Intervals for the Population Mean?
A: Confidence interval for the mean is a way of estimating the actual population mean. Instead of…
Q: 1. If X=87, o=9, and n=69, construct a 99% confidence interval estimate of the population mean, μ.…
A: For know variance we used the normal distribution and for unknown variance we uses the t…
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A: The data set is 192 183 312 227 309 396 402 390
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A: Using the Z formula to find the solution
Q: If X = 148, o = 27, and n = 30, construct a 99% confidence interval estimate of the population mean,…
A: Given, X = 148 σ = 27 n = 30 Here, X =Mean σ = Standard deviation To find, 99% confidence interval…
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A: When the sample size is greater than 30, the Z-distribution could be used to construct the 95%…
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A: 181 287 240 256 257 179 209 296 211 231 171 248 189 212 189 187
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A: Given information: In the survey of 365 working parents, 195 parents said that they spend little…
Q: You may need to use the appropriate appendix table or technology to answer this question. The…
A: * SOLUTION :-
Q: The table below shows data on a subsample of participants in the 7th examination of the Framingham…
A: Confidence interval is a range that shows the probability of true mean falling into that interval.
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A: Hi! Thank you for the question, As per the honor code, we are allowed to answer three sub-parts at a…
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A: Ho is nothing but the null hypothesis where Ha is alternate hypothesis.
Q: The 95% confidence interval for B, is the interval: OA. (-1.96SE(,). Â + 1.96SE (#,)). O B. (…
A: The 95% confidence interval defines a range of values that you can be 95% certain contains the true…
Q: he mean of the sampling distribution of the sample means. ) =] Type an integer or a decimal.) he…
A: Standard deviation is the proportion of scattering of a bunch of information from its mean. It…
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A: Given, Time- 3.9 minutes ∑ ? = 205 ∑(? − ?̅)2 = 56.43
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Q: Police recorded the average speed of cars driving on a busy street by a school. For a sample of 16…
A: please find the answer below.
Q: 1. A survey on student behavior in some major College in Oman asked a randomly selected group of 300…
A: a) Given mean μ = 4.5 Standard deviation σ = 2.9 For 95% confidence, z= 1.96 Sample size n = 300…
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- The nutrition label for Oriental Spice Sauce states that one package of sauce has 1030 milligrams of sodium. To determine if the label is accurate, the FDA randomly selects 130 packages of Oriental Spice Sauce and determines the sodium content. The sample has an average of 1000.15 milligrams of sodium per package with a sample standard deviation of 271.69 milligrams. Step 1 of 2 : Calculate a 95% confidence interval for the mean sodium content in Oriental Spice Sauce. Round your answers to two decimal places.3. A simple random sample of 36 items resulted in a sample mean of 60 and a standard deviation of 12. Construct a 95% confidence interval for the population meanA sample of 81 observations is taken from a normal population with a standard deviation of 6.The sample mean is 41. Determine the 99% confidence interval for the population mean.
- Goofy Marketing Solutions conducted a survey among 16 randomly selected visitors to the newly opened Outlet Shoppes at Atlanta to measure their satisfaction with the shopping experience. The sample satisfaction score is normally distributed around a mean of �¯=67with a sample standard deviation of s=7.509. Determine the 95% confidence interval for the population mean from the sample. The upper limit of the 95% confidence interval is (rounded)....Cell phones have become an essential part of our everyday lives. We use them for communication, photography, browsing, and banking, among other things. Choosing the right cell phone is important, and is based on several factors, including weight. Suppose the weight of a cell phone is distributed normally with a known population standard deviation of 18 g. A random sample of 15 cell phones was conducted to calculate a sample mean weight of 155.7 g. Construct a 95% confidence interval for the population mean weight, mu. Choose the correct answer below based on constructing this interval (it may be a good idea to write your final interval down, as the next question may relate to this one). Hint: although the sample size is small, you may use the standard normal distribution, as the population standard deviation is known. Hint: we cover this in the video "CI 2020 2" a. the interval is [146.59, 164.81); the critical value used is 1.96 O a) O b) b. the interval is (146.59, 164.81] ; the…Police recorded the average speed of cars driving on a busy street by a school. For a sample of 16 speeds, it was determined that the average amount over the speed limit for the 16 speeds was 11.4 mph with a standard deviation of 6 mph. The 90% confidence interval estimate for this sample is 8.77 mph to 14.03 mph. a) What is the margin of error for this problem? b) What size sample is needed to reduce the margin of error to no more than + 17 a) The margin of error isOmph.
- The sugar content in a one-cup serving of a certain breakfast cereal was measured for a sample of 140 servings. The average was 11.9 g and the standard deviation was 1.1 g. a. Find a 95% confidence interval for the mean sugar content. b. Find a 99% confidence interval for the mean sugar content. c. What is the confidence level of the interval (11.81, 11.99)? d. How large a sample is needed so that a 95% confidence interval specifies the mean to within±0.1? e. How large a sample is needed so that a 99% confidence interval specifies the mean to within±0.1? f. Find a 95% upper confidence bound for the mean sugar content. g. The claim is made that the mean sugar content is greater than 11.7g. With what level of confidence can this statement be made?A researcher is interested in estimating the mean blood alcohol content (BAC) of people arrested for driving under the influence. The sample consists of 250 individuals with a mean BAC of .145. Based on past data, the researcher assumes a population standard deviation of .065.What's the margin of error for a 90% confidence interval in this scenario Select one: a. 0.0068 b. 0.0041 c. Not enough information to compute the margin of error d. 0.107 e. 0.008A chemist measures the haptoglobin concentrations (in grams per liter) in the blood of eight healthy adults. The mean and standard deviation of the haptoglobin concentrations (in grams per liter) are 1.615 and 1.387 respectively. Obtain a 90% confidence interval for the mean haptoglobin concentration in adults.
- The operations manager at a compact fluorescent light bulb (CFL) factory needs to estimate the mean life of a large shipment of CFLs. The manufacturer’s specifications are that the standard deviation is 1,000 hours. A random sample of 64 CFLs indicated at sample mean life of 7,500 hours. Construct a 95% confidence interval estimate for the population mean life of compact fluorescent light bulbs in this shipment. Based on your confidence interval, make inference about the population parameter. Do you think that the manufacturer has a right to state that the compact fluorescent light bulbs have a mean life of 8,000 hours? Please explain. To answer these questions, is it compulsory to assume that the population compact fluorescent light bulb life is normally distributed? Why, why not. Suppose that the standard deviation changes to 800 hours. What are the answers for the first and second question?A major newspaper (that rhymes with Small Street Journal) reported an average household income for its subscribers is $119,155. Assume this estimate of the mean household income is based on a sample of 80 subscribers, and, based on past studies, the population standard deviation is known to be sigma=$30,000. Construct a 95% confidence interval for the population mean. Group of answer choices $60,356 - $177,954 $118,420 - $119,890 $112,447 - $125,863 $112,581 - $125,7296. Western Trucking Company has 42 vehicles in its fleet. To estimate the average mileage in its entire fleet, the dispatcher took a random sample of 6 trucks and found the sample mean and sample standard deviation to be 57,393 and 12,300 miles respectively. Assuming the population mileage is approximately normal, form a 99% confidence interval for the mileage on all company trucks.