From a random sample of 25 days in a recent year, gasoline prices had a mean of 51.25 pesos and a standard 5.32 pesos. Construct a 99% confidence interval for the population mean.

Q: From a random sample of 64 high school seniors, the sample mean and standard deviation of the math…

A: The sample size is 64, sample mean is 96, and standard deviation is 16. The degrees of freedom is,…

Q: From a random sample of 49 high school seniors, the sample mean and standard deviation of the math…

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Q: Calculate the margin of error for a 95% confidence interval for the population mean.

A: Given that the sample size is n = 32 Population SD = 5 At 95% confidence level, the critical value…

Q: Suppose you observe 77 data points from a distribution with standard deviation 8.4, and you…

A: Given that,  σ=8.4,n=77 Critical values: By using the z-table, the critical value at 92% confidence…

Q: A sample of 40 cows is drawn to estimate the mean weight of a large herd of cattle. If the standard…

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Q: In a random sample of 60 computers, the mean repair cost was $150 with a standard deviation of $36.…

A: Solution is given below.

Q: What is the talpha/2 value to use for calculating a confidence interval from a sample of size 45…

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Q: In a simple random sample of 38 bulbs, 25 gives a good glow, What is a 85% score Confidence interval…

A: Given data,n=38x=25sample proportion p=xn=2538=0.66z-value at 85% confidence is Zc=1.44

Q: According to the National Health Statistics Report, a sample of 360 one year old baby boys in the US…

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Q: The population standard deviation for the height of college hockey players is 3.4 inches. If we want…

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Q: A financial institution wishes to estimate the mean balances owed by its credit card customers. The…

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Q: A sample of 36 men has a mean weight of 175 pounds with a sample standard deviation of 13 pounds.…

A: It is given that sample mean is 175 and standard deviation is 13.

Q: Find the Confidence interval for the true Population Mean if a sample of 50 has a mean of 26.8 and a…

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Q: From the scores in subject statistics for 8 students, it was found that the mean score is 73 and the…

A: We have given that,  Sample mean (x̄) = 73,  standard deviation (s) = 5.15 and sample size (n) = 8…

Q: Construct a 90​% confidence interval for the population standard deviation σ at Bank B.

A: The descriptive analysis is conducted using EXCEL. The software procedure is given below: Enter the…

Q: In a recent study of 42 eighth graders, the mean number of hours per week that they watched…

A: Mean = 19.6 Standard deviation = 5.8 Sample size n = 42

Q: In order to help identify baby growth patterns that are unusual, we need to construct a confidence…

A: As from the above data we have, X¯= 40.6 cm.n( Sample size)=100Standard Deviation(s)=1.6 cm. We are…

Q: An analyst is planning to estimate the mean of a quantitative variable using a 95% confidence…

A: Given that, Critical value: Using the z-table, the critical value at 95% confidence level is

Q: Calculate a 90% confidence interval for the mean of the population, supposed normal, from which…

A: Given, Heights 63 63 66 67 68 69 70 70 71 71 Let X be height of  animal…

Q: construct a confidence interval at a 80% confidence level. stributed population.

A: Given : n=15 , X-bar=45  , s=5  , α=0.20 Here , we want to find the 80% confidence interval for the…

Q: Based on a random sample of 1,020 adults, the mean amount of sleep per night is 8.09 hours. Assuming…

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Q: Find the margin of error for a​ 95% confidence interval for estimating the population mean when the…

A: Sample S.D = s = 110

Q: With an 80% confidence for sample proportion 46 and sample size 29, what is the upper confidence…

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Q: For a confidence level of 98%, find the critical value for a confidence interval on a one sample…

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Q: The average weight of 50 randomly selected minivans was 4,200 pounds. The minivan population…

A: Introduction: The 100 (1 – α) % confidence interval for the population mean, μ, when the population…

Q: In a random sample of ten ​people, the mean driving distance to work was 23.2 miles and the standard…

A: Provided information is ; Sample size(n) =10  Mean(μ) = 23.2 Sample standard deviation(s) = 5.3…

Q: In a sample of 32 students, the mean scholarship amount received was $887, with a standard deviation…

A: Given information: n=32x¯=887s=27.4 df=n-1=32-1=31 Confidence level is 90% Significance level is…

Q: A food snack manufacturer samples 11 bags of pretzels off the assembly line and weighs their…

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Q: How large a sample should be used to provide a 95% confidence interval with a margin of error of 4,…

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Q: In a survey sample of 83 respondents, the mean number of hours worked per week is 39.04, with a…

A: Solution : The complete solution is given below in the attachment file.

Q: Based on this, what is the margin of error associated with a 95% confidence interval for the true…

A: Given : n=36 , X-bar=35  , σ=2.3  , α=0.05 Since , the population standard deviation (σ) is known.…

Q: Derive the necessary expression for one-sided lower confidence interval for the population variance…

A: we know that if any random variable x follows normal distribution (population) with mean μ and…

Q: 3. Another engineer studies the strength of cables, which has a known population standard deviation…

A: Here we need to obtain the minimum sample size required to obtain a 97% confidence interval.

Q: In a survey, 23 people were asked how much they spent on their child's last birthday gift. The…

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Q: Find the desired sample size for a 90% confidence interval with a margin of error equal to 0.03

A: Given information: Denote the population proportion as p. Since, the preliminary estimate of the…

Q: A given poll states "54% of fifth graders read at or above the fifth-grade-level." If there is a…

A: According to the given information it is required to compute the 95% confidence interval for the…

Q: average expenditure per student (based on average daily attendance) for a certain school year was…

A: Define the Null and alternative hypotheses:   Null Hypothesis:    H0: µ = 10,337.   Alternate…

Q: In a random sample of 250 students who enrolled in Science, 150 took notes during classes. Find an…

A: Given that n=250,x =150,alpha =0.05 Find an approximate 95% confidence interval for the population…

Q: The national fire protection association reported that house fires in the United States result in…

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Q: On the Stanford-Binet test, the mean IQ is 100. A class of 21 kindergarten pupils were tested with a…

A: Given  population mean μ=100, n=sample size=21, sample mean x̄=92, sample standard deviations s=6.92…

Q: In a preelection poll, a pollster finds that 442 out of 650 people polled favor Smith. Construct the…

A: We need to construct the 95% confidence interval for the population proportion. We have given the…

Q: Construct a 95% confidence interval for the population standard deviation σ if a sample of size 10…

A: Solution

Q: From a random sample of 24 months from January 2006 through December 2016, the mean number of…

A: x¯=100σ=114n=24Confidence interval = 90%

Q: A bank wishes to estimate the mean balances owed by customers holding MasterCard. The population…

A: Determine the sample size n needed.   Obtain the critical value of z at the 98% confidence level.…

Q: 2. A sample of seven college wrestlers had an average weight of 267 pounds with a sample standard…

A: Given that  Sample size (n)=7  Sample mean = 267  Sample standard deviation (s)= 10  We have to find…

Q: A food snack manufacturer samples 15 bags of pretzels off the assembly line and weighed their…

A: Here, sample mean is x-bar = 10.2, the sample standard deviation is s = 0.25 and sample size n = 15.…

Q: What is the smallest sample size that guarantees that the margin of error is less than 3% when…

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Q: A sample of 120 students yielded a sample mean GPA of 3.35, end a sample standard deviation equal to…

A: Obtain the 95% confidence interval for the population mean GPA. The 95% confidence interval for the…

Q: A consumer agency estimate the proportion of all drivers who wear seat belts while driving. What is…

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