How smart is your phone? A random sample of 11 smartphones sold over the internet had the following prices, in dollars: 199 169 385 329 269 149 135 249 349 299 249 Assume the population standard deviation is "q"=85. a. Explain why it is necessary to check  whether the population is approxiamately normal before c confidence interval.

Q: Given the sample information below, what test statistic should be used to determine whether the…

A: For determining the standard deviations are equal for two populations or not, the F test statistic…

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Q: Normal, with mean 70 inches and standard deviation 8 inches. ) If you choose one student at random,…

A: We have given that.   X~N( μ , ?^2 )   μ =6 , ? =2.4  , n= 25   Z-score =( x - μ )/?

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A: From the provided information, The mean and standard deviation for the sales from China is as…

Q: A small business ships specialty homemade candies to anywhere in the world. Past records indicate…

A: Solution-:  Here, is unknown so we use t-test Given: We find, (a) What is the standard error? (b)…

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A: From the provided information, Standard deviation (σ) = 8 Confidence level = 95% Margin of error (E)…

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A: Given Information:  Units in percentage of hospitals providing at least some charity care : 56.5…

Q: A simple random sample of 400 individuals provides 100 Yes responses. a. What is the point estimate…

A: Given information x = 100 Sample size (n) = 400

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A: Given,Standard deviation σ = 64Sample size n = 15Sample mean x¯ = 912

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Q: Determine the sample size needed to construct a 95% confidence interval for the population mean, μ,…

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Q: 3 In a large city the distribution of incomes per family has a standard deviation of $5200. (i) For…

A: According to central limit theorem, if the population is normally distributed or sample size is at…

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A: According to our guidelines we can answer only three subparts and rest can be repost.

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A: It is given that sample mean is 100 and the standard deviation is 25.

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A: Hey there! Thank you for posting the question. Since there are multiple questions posted, we will…

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Q: A simple random sample of 12 iPhones being sold over the Internet had the following prices in…

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Q: c. What is the margin of error for a 90% confidence interval estimate for the difference between the…

A: Given data: First round Final round 71 75 69 68 69 66 73 76 69 72 69 75 72 72 69…

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Q: A sports shop records the sales of items made in China and those made in America. Country of…

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Q: B. In a survey, 27 people were asked how much they spent on their child's last birthday gift. The…

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Q: The monthly earnings of a group of business students are normally distributed with a standard…

A: Given Standard deviations=532 Margin of error=132 At 93% confidence level the z is 1.81

Q: For a group of 15 men subjected to a stressful situation, the mean number of heartbeats per minute…

A: Sample size (n) = 15Sample mean (x̅) = 126Standard deviations (s) = 4 Significance level (α) = 1-…

Q: The daily intakes of milk (in ounces) for ten randomly selected people were: 23.3 28.4 10.5 16.4…

A: Confidence interval: The (1-α) % confidence interval for population standard deviation is given by:

Q: Find the length of a 99% confidence interval for the mean of the sample with a standard deviation of…

A: We have given that the 99% confidence interval for the mean of the sample with a standard deviation…

Q: In 2017, Americans spent a record-high $9.1 billion on Halloween-related purchases (the balance…

A: Given data is14,68,25,64,31,33,32,44,50,15,16,96,46,35,64,28sample size(n)=16

Q: A random sample of the number of farms (in thousands) in various states follows. Use these data to…

A: It is given that the population standard deviation is 31.

Q: A sample of 49 managers reveals a sample mean of $45,420. The standard deviation of the sample is…

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Q: According to Dietary Goals for the US (1977), high sodium intake may be related to ulcers, stomach…

A: We have given that  Sample size n =9 Sample mean =214 Standard deviation =7.5

Q: A sample of 49 managers reveals a sample mean of $45,420. The standard deviation of the sample is…

A: Given: n=49, x=45420 and s=2050. Use z test and the value of z at 95% confidence interval is 1.96.

Q: The amount of material used in making a custom sail for a sailboat is normally distributed with a…

A: Confidence interval is a range of values it contains the true population parameter with specified…

Q: An electrical firm manufactures light bulbs for LCD projectors. A randomly selected sample of 24…

A: We have given that,  Sample mean (x̄) = 600 hours, standard deviation (s) = 50 hours , sample size…

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Q: Suppose that you wanted to estimate the population mean amount spent eating out per week by…

A: The question is about sample size estimation Given: Sample std. deviation = 200 dollars Margin of…

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A: Given problem Given that   Whys is it desirable to have the explanatory variables spread out to…

Q: 530 males in the sample who gave a numeric response from 0 to 6, the mean was 2.51 and the standard…

A: Provided information is, n =530 x̅ =2.51 s =0.87 90% confidence interval can be calculated as:…

Q: Find the length of a 99% confidence interval for the mean of the sample with a standard deviation of…

A: We have given that the confidence interval 99% for the mean of the sample with a standard deviation…

Q: - A large on-demand video streaming company is designing a large-scale survey to determine the mean…

A: Given information- Population standard deviation, σ = 3 hours Confidence interval = 0.95…

Q: Solve the problem. How much money does the average professional football fan spend on food at a…

A: Given,sample size(n)=10sample mean(x¯)=$70standard deviation(s)=$17.50α=1-0.95=0.05α2=0.025degrees…

Q: The amount of material used in making a custom sail for a sailboat is normally distributed with a…

A: Given σ=64, n=15  and  x¯=912

Q: An economist is interested in studying the incomes of consumers in a particular country. The…

A: The population standard deviation = $1,000.Z value for 90% confidence interval is 1.645.Sample size…

Q: (a) Does the size of the orifice affect the mean percentage of radon released? Use a =0.05. (b) Find…

A: Here the mean and variance of various groups orifice diameter are SUMMARY       Groups Count…

Q: Do you want to own your own candy store? With some interest in running your own business and a…

A: We have given that  Sample size n=9 ,xbar=106.9 ,s=29.4 And degree of freedom =df=n-1

Q: According to Dietary Goals for the US (1977), high sodium intake may be related to ulcers, stomach…

A: We have given that, Mean(x̄) = 238, standard deviation (s) = 8.3, sample size (n) = 9 and confidence…

Q: According to the report by the​ government-lending institution, college students who have credit…

A: Given that  Hypothesized Population Mean (\mu)(μ) = 10661066 Population Standard Deviation…

Q: 1) In an effort to estimate the mean amount spent per customer at Oliver's Eatery in Astoria,…

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

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A: Given information- Population standard deviation, σ = 4 hours Confidence interval = 0.98…

Q: A survey is conducted on attitudes towards drinking. A random sample of eight married couples is…

A: A data is called paired data if one observation of a sample is related with a specific observation…