Estimation of parameters   The average hour spent in computer by 20 senior high school students during online class is 7 hours with a standard deviation of 2 hours. Construct a 98% confidence interval of the average hour spent by all senior high school students. Identify the width of the interval.

Q: A city planner wants to estimate the average monthly residential water usage in the city. He…

A: The provided sample mean is Xˉ=3407.80\bar X = 3407.80 gallons and the population standard deviation…

Q: Rock band The Rolling Stones have played scores of concerts in the last twenty years. For 30…

A: From the given information we want to find the 99% confidence interval.

Q: Data were collected on the amount spent by 64 customers for lunch at a major Houston restaurant.…

A: Note: Hi there! Thank you for posting the question. The sample mean x̅ is needed to obtain the…

Q: The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on…

A: Given,   Sample size = 359 Sample mean = 45.6 Sample standard deviation = 21.3   Since the…

Q: Determine the level of confidence in the preparation of the population mean confidence interval if…

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Q: The Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16…

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Q: An important factor in selling a residential property is the number of people who look through the…

A: Since the sample size is small and population standard deviation is unknown, t distribution can be…

Q: A random sample of 25 books is taken from a publisher's stock.  On average, each sampled book has 30…

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Q: the standard deviation of the weights of elephants is known to be approximately 15 pounds. We wish…

A: Obtain the 95% confidence interval for the mean weight of newborn elephant calves. The 95%…

Q: Dr. Nunez wants to estimate the average lung capacity of adults in her state. She plans on taking a…

A: Given data, Margin of error E=100 standard deviation σ=300 z-value at 99% confidence is Zc=2.576…

Q: the mean amount spent​ ($) on a certain retail website by members of the​ website's premium program.…

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Q: 36 SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are…

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Q: A data set includes 103 body temperatures of healthy adult humans having a mean of 98.1°F and a…

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Q: Determine the minimum sample size needed for a confidence interval for the mean.  A study of peach…

A: Determine the sample size n needed. Use EXCEL Procedure for finding the critical value of z. Follow…

Q: In order to determine the average weight of carry-on luggage by passengers in airplanes, a sample of…

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Q: Your statistics lecturer wants you to determine a confidence interval estimate for the mean test…

A: It is given that Sample size n = 30 Sample mean M = 74.2 Population SD = 30.9 The critical value of…

Q: Total plasma volume is important in determining the required plasma component in blood replacement…

A: given that,population standard deviation, σ =7.5sample mean, x =36.7size (n)=50

Q: An important factor in selling a residential property is the number of people who look through the…

A: Given information:Sample size (n) = 14Sample mean=25Sample standard deviation=6

Q: The average time taken by a sample of 68 runners to complete a 10km race was 42 minutes. Assuming a…

A: It is given that, the sample size is 68, that is, n = 68. The population standard deviation = σ =…

Q: Data on 4100 college graduates show that the mean time required to graduate with a​ bachelor's…

A: The sample mean = 5.39. Standard deviation is 1.59. The sample size, n is 4100.          From the…

Q: A student wants to estimate the mean score of all college students for a particular exam. First use…

A: It is given that the range is from 800 to 1000. By the range rule of thumb, the standard deviation…

Q: The average monthly gas bill of a random sample of 33 residents of a city is $132 with a standard…

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Q: Test the suitability of the data given in the picture for uniform distribution in the range…

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Q: BBM is trying to estimate the mean salary. A sample of 15 employees shows that the sample mean 559…

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Q: Reading Times A survey taken several years ago found that the average time a person spent reading…

A: From the provided information, Population mean (µ) = 10.8 minutes Standard deviation (σ) = 3 minutes…

Q: The distribution of study times for first year students follows a Normal distribution with standard…

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Q: A physicist examines 10 water samples for iron concentration. The mean iron concentration for the…

A: From the given information, the sample size is 10, the sample mean iron concentration for the sample…

Q: The average monthly gas bill of a random sample of 43 residents of a city is $185 with a standard…

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Q: A city planner wants to estimate the average monthly residential water usage in the city. He…

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Q: A researcher wants to estimate the number of hours that senior high school students spend on social…

A: Sample size, n = 50. Mean spending time, x¯ =5. Population Standard deviation, σ=0.5. Confidence…

Q: Examine if the data set that was collected appear to be normally distributed and build 95%…

A: Here, x x-x (x-x)2 72 17.7 313.29 68.4 14.1 198.81 48 -6.3 39.69 28.8 -25.5 650.25…

Q: A data set includes 104 body temperatures of healthy adult humans having a mean of 98.7°F and a…

A: Given: Xˉ=98.7 s=0.66 n=104  The number of degrees of freedom is, df=104−1=103 The critical t-value…

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

A: Given data,σ=1000n=50x=15000Z value at 99% confidence is Zc=2.576

Q: An important factor in selling a residential property is the number of people who look through the…

A: From the given information, Sample size (n) = 24 Standard deviation (s) = 5. Sample mean (x-bar) =…

Q: college would like to estimate the proportion of its students that work full-time while going to…

A: Given data,Number of students n=423Students worked full time is x=160

Q: 7. A university takes 900 students to estimate the average of their incomes. The university allow an…

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Q: A light bulb manufacturer guarantees that the mean life of its brand of light bulb is 750 hours. If…

A: Null hypothesis: µ=750. Alternative hypothesis: µ≠750. This is a two-tailed test. Here, the sample…

Q: Planning engineers want to construct a confidence interval for the standard deviation of the runtime…

A: Given: s2 = 1225352 nn = 2525

Q: Determine the point estimate of the population mean and margin error for the confidence interval.…

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Q: You want to estimate the mean weight of quarters in circulation. A sample of 40 quarters has a mean…

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Q: Find the 86% confidence interval of the population mean.

A: It is given that Sample size n = 164 Sample mean M = 3200 Population SD = 215 The critical value of…

Q: A researcher wants to estimate the number of hours that 5-year old children spend watching…

A: Given that n=25, mean=3,s.d=0.5,alpha=0.10

Q: A random sample of 64 shoppers showed that they spend an average of $27.31 per visit at the Sunday…

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Q: Newspaper Reading Times A survey taken several years ago found that the average time a person spent…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: A consumer advocate analyses the nicotine content in some brand of cigarettes. A sample of 20…

A: We have ro find ci.

Q: A student wants to estimate the mean score of all college students for a particular exam. First use…

A: Given that, From the given information, the possible scores range from 500 to 2000. Here, the…

Q: There ▼(Choose one) enough evidence to support the claim that there is a change in the average time…

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Q: In insurance company has thousands of customers, and they want to estimate their mean life…

A: Solution according to the guidelines we solve only three subparts

Q: A data set includes 106 body temperatures of healthy adult humans having a mean of 98.9 degrees F…

A: Given,sample size(n)=106sample mean(x¯)=98.9standard deviation(s)=0.62degrees of…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.