If a researcher found that the margin of error =0.9 and the sample mean from the study was 17.7, what is the upper bound confidence interval limit?

Q: A recent study among 150 street hawkers in Cape Town showed that 48 of them are of the opinion that…

A: Given Data: n=150 x=48

Q: a 99% confidence interval

A: Confidence interval :  Confidence interval measures the degree of uncertainty. or it is the…

Q: Suppose a different police department says their SRS resulted in a 95% confidence interval of 10.1%…

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Q: The student government association at a university wants to estimate the percentage of the student…

A: It is given that margin of error (E) is 0.03 and the confidence level is 0.90.

Q: Suppose that a 95% confidence interval for the average number of minutes a regular customer uses…

A: From the provided information, Confidence level = 95% Confidence interval = 110 plus minus 35…

Q: If a school district takes a random sample of 80 Math SAT scores and finds that the average is 421,…

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Q: If a school district takes a random sample of 63 Math SAT scores and finds that the average is 488,…

A: Given information Sample size (n) = 63 Sample mean x̅ = 488 Population standard deviation σ = 100…

Q: If a 90% confidence interval for the difference of means μ 1 − μ 2 contains all negative values,…

A: The mean of first population is denoted as μ1 and mean of second population is denoted as μ2.

Q: A recent Gallop poll showed that 672 of 1019 adults nationwide think that marijuana should be…

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Q: In one of the studies, it was found that, in a random sample of 261 married persons, 135 were…

A:

Q: If a school district takes a random sample of 53 Math SAT scores and finds that the average is 488,…

A: Given Information: Sample size n=53 Sample mean x¯=488 Population standard deviation σ=100

Q: If a school district takes a random sample of 75 Math SAT scores and finds that the average is 433,…

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Q: A study is being planned by a pharmaceutical company to estimate the proportion of customers who…

A: We have given that,  Margin of error (E) = 3% = 0.03, confidence interval = 95%  Then,  We will find…

Q: Suppose that the population standard deviation of student scores is 20. What will be the sample size…

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Q: If a school district takes a random sample of 75 Math SAT scores and finds that the average is 433,…

A: It is given that the mean is 433 and the population standard deviation is 100.

Q: A nutritionist believes that obesity is more prevalent among American adults than it was in the…

A: Hence we are given that; x1=380, n1=1630x2=726, n2=2350 Hence the sample proportions are;…

Q: Suppose we take a SRS of high school seniors and get a 95% confidence interval that 250 to 278…

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Q: We have calculated a 95% confidence interval and would prefer for our next confidence interval to…

A: The next confidence interval can have a smaller margin of error by increasing the sample size. That…

Q: Identify the t-score for a 90% confidence interval if the sample size is 31. t =

A: c1=90%n=31α=1-0.90=0.10df=n-1=31-1=30

Q: If a school district takes a random sample of 80 Math SAT scores and finds that the average is 497,…

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Q: If a school district takes a random sample of 89 Math SAT scores and finds that the average is 497,…

A: From the provided information, Sample size (n) = 89 Sample mean (x̅) = 497 Population standard…

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: if for some reason it was not possible to obtain the 99% confidence interval from SPSS, how could…

A: Given information: Confidence level=99%=0.99α=1%=0.01

Q: "if the confidence level or P-value does not change very much when the conditions for use of the…

A: In general, t-test is used for small samples and samples are normally distributed. It is used when…

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

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Q: A study found a confidence interval on the proportion of children that are hearing impaired was 0.04…

A: Given confidence interval is 0.04 to 0.16 i.e., p-E=0.04 -->1 p+E=0.16 -->2

Q: If a school district takes a random sample of 89 Math SAT scores and finds that the average is 494,…

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

A: Point estimate: The population parameter which is estimated by using sample statistic is termed as…

Q: how many students do we need to construct a 95% confidence interval for the proportion of the…

A: here given ,  margin of error  = 3% = 0.03  confidence level = 95%  n = 150  p^= 0.68

Q: If you construct a 90% confidence interval of the mean amount of money a student receives just from…

A: Given 90% confidence interval of the mean amount of money a student receives just from financial aid…

Q: Suppose a drug for stomach discomfort is tested on 75 subjects, and the mean time for it to take…

A: Given: Sample size n = 75 Sample mean X = 200 Population standard deviation σ = 30 Formula Used:…

Q: Based on the regression output, what lower bound of the 95% confidence interval for the coefficient…

A: The sample size n is 30.

Q: What prerequisites should students have the knowledge of before calculating the confidence intervals…

A: Determine the prerequisites should students have the knowledge of before calculating the confidence…

Q: If a school district takes a random sample of 50 Math SAT scores and finds that the average is 47,…

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Q: Suppose a drug for stomach discomfort is tested on 50 subjects, and the mean time for it to take…

A: To find the confidence interval we will use z distribution because the population standard deviation…

Q: Find the minimum sample size required to construct a 95% confidence interval estimate for the…

A: From the provided information, Margin of error (E) = 3.5% or 0.035 Confidence level = 95%

Q: identify the t-score for a 90% confidence interval if the sample size is 31.        t=

A:

Q: A sample of 14 commuters in Chicago showed the average of the commuting times was 33.2 minutes. If…

A: Given that x bar =33.2.s.d =8.3,n=14,alpha=.05

Q: has a mean life of 480 hours, construct a 99% confidence interval for the mean of the flashlights…

A: here population standard deviation  = 35 sample size  = 150  sample mean   = 480 and Z-critical for…

Q: A 95% confidence interval is constructed in order to estimate the proportion of adults who own an…

A:

Q: When calculating a confidence interval for one sample with a continuous outcome and the sample…

A: It is given that the sample size is greater than 30.

Q: Would it be reasonable to develop a confidence interval from these data to show the mean number of…

A: John is interested to know the number of hours children under 12 years if age watched TV per day.…

Q: What is the minimum required sample size to make a 96% confidence interval for a population mean if…

A: Margin of error=E=2 Standard deviation=σ=12 96% confidence interval  E=Zc×σ/√n n=sample size

Q: If a school district takes a random sample of 55 Math SAT scores and finds that the average is 422,…

A: It is an important part of statistics . It is widely used .

Q: If a school district takes a random sample of 61 Math SAT scores and finds that the average is 466,…

A: Find a 99% confidence interval for the mean math SAT score for this district.

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: From the estimation of the number of aggravated assault (816,760) in 2015 at a 99% confidence…

A: Given that  99%confidence interval  (816,760)

Q: If a school district takes a random sample of 80 Math SAT scores and finds that the average is 442,…

A: Given that, Sample size n=80 Sample average x¯=442 Population standard deviation σ=100

Q: The general form of a confidence interval is inferred as

A: Confidence interval : The probability that a parameter will fall between two values around the mean…