In a survey, 19 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $34 and standard deviation of $5. Find the margin of error at a 95% confidence level.

Q: In estimating the population mean with the population standard deviation unknown, if the sample size…

A: Given that, Population standard deviation is unknown and sample size (n) = 27

Q: You read in a U.S. Census Bureau report that a 90% confidence interval for the median income in 2012…

A: It is given that 90% confidence interval for the median income in 2012 of American households was…

Q: Among various ethnic groups, the standard deviation of heights is known to be approximately three…

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Q: Among various ethnic groups, the standard deviation of heights is known to be approximately three…

A: Using Excel formula “=NORM.S.INV(1-(0.04/2))”, the critical value for 96% confidence level is…

Q: Calculate the sample mean and the sample standard deviation to the nearest hundreths.

A: Given: X 0.5 1.75 2 2.25 2.25 2.5 2.75 3.25 3.75 3.75 4.25 4.25 4.25…

Q: In a study by Sallie Mae and Gallup, 223 of the 934 respondents said that they paid for their…

A: Obtain the 95% confidence interval for the proportion of students who paid for their education by…

Q: In a situation where the sample size was decreased from 39 to 29 in a normally distributed data set,…

A: Confidence interval formula is given by

Q: If the variance of a national accounting examination is 900, how large a sample is needed to…

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Q: If you knew that a study reported that 73% of pre-kindergarten children ages 3 to 5 whose mother had…

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Q: For a confidence level of .90, what is the significance level?

A: We have find significant leval..

Q: In 1955, Life Magazine reported that the 25 year-old mother of three worked, on average, an 80hour…

A: Solution: Given information: n= 85 Sample size  x= 83.5 Sample mean μ= 80 Populaion Mean s= 10…

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

A: Sample size : n=14 Sample mean : x¯=33.2 Sample standard deviation : s=8.3 Confidence level :…

Q: What is the effect of sample size on the width of a confidence interval?

A: If the sample size is increased, then the corresponding margin of error is decreased. Hence, the…

Q: When testing a hypothesis about a single mean, if the sample size is 51 and the population standard…

A: From the provided information, Sample size (n) = 51 The population standard deviation is known.

Q: A bank wishes to estimate the mean credit card balance owed by its customers. The population…

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Q: Use the given confidence interval to find the margin of error and the sample mean.

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Q: Given a mean of 483, a standard deviation of 29, and a sample size of 60, construct a 95 %…

A: A mean of 483, a standard deviation of 29, and a sample size of 60, construct a 95% confidence…

Q: In a study of government financial aid for college​ students, it becomes necessary to estimate the…

A: Find z-critical value:…

Q: reported that the 27-year-old mother of three worked, on average, a 75 hour week. Recently, many…

A: As the population standard deviation is not known, we will use a t-test. The null and alternative…

Q: Assume the sample standard deviation is s=10, what do you conclude?

A: here given, sample mean = 87 n = 25 sample standard deviation  = 10

Q: Given a mean of 62, a standard deviation of 8, and a sample size of 150, construct a 99.7%…

A: Given that a mean of 62, a standard deviation of 8 and a sample size of 150. We have to construct a…

Q: if the sample mean is 10, the population standard deviation is 20, and the sample size is 25, then…

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Q: Determine the margin of error for the confidence interval for the proportion: 0.575 <p<0.722

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Q: If you knew that I study reported that 67% of pre-kindergarten children ages 3 to 5 whose mother had…

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Q: A travel agency wishes to estimate, at 99% confidence and to within $100, the mean airfare for…

A: According to the given information, we have Standard deviation = $275 Margin of error = $100…

Q: In a study of government financial aid for college​ students, it becomes necessary to estimate the…

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Q: See Table 2 above and answer the following questions:   What can you conclude from the above…

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

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: Please answer the last part of C:

A: The mean difference is $850 and the sample deviation is sd is $1,123.

Q: If X̅ = 65, ? = 20 ??? ? = 36, construct a 95% confidence interval estimate for the population mean,…

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Q: If a confidence interval for the mean is (41≤μ≤84)(41≤μ≤84), a) What is the point estimate?    b)…

A: a) What is the point estimate?

Q: If a class took an exam and scored a mean of 82 with a standard deviation of 12, what would be the…

A: Given, Mean(x)=82Standard Deviation(s)=12

Q: Allan, a Grade 12 senior high school student, wants to estimate the average number of students who…

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Q: If a confidence interval for the mean is (43≤μ≤82)(43≤μ≤82), a) What is the point estimate?    b)…

A: Given the confidence interval for the population mean in tri-linear inequality form: Hence,

Q: In a study of government financial aid for college​ students, it becomes necessary to estimate the…

A: Assume sample proportion(p^)=0.5margin of error(E)=0.05α=1-0.99=0.01α2=0.005Z0.005=2.58    (from…

Q: Use the accompanying Grade Point Averages data to find 80%, 85%, and 99% confidence intervals for…

A: The degrees of freedom is, df=n-1=30-1=29 The degrees of freedom is 29. Computation of critical…

Q: A guidance counselor wishes to determine the mean number of changes in academic major by college…

A: Given that, Standard deviation = 0.45 90% confidence level

Q: For a group of 10 men subjected to a stress situation, the mean number of heart beats per minute was…

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Q: Please answer the last part of letter C:   Answers: 498 and 1200 does not work 499 and 1200 does not…

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Q: In a study of government financial aid for college​ students, it becomes necessary to estimate the…

A: The required sample size is calculated by using the formula:

Q: Bank of America's Consumer Spending Survey collected data on annual credit card charges in seven…

A: From the provided information, Sample size (n) = 42 Mean difference = $850 Sample standard deviation…

Q: A study of a local city is being conducted to find out the average number of people that use public…

A: It is given that confidence level is 0.90, standard deviation is 100 and margin of error E is 11.

Q: Use the accompanying Grade Point Averages data to find 90%, 95%, and 99% confidence intervals for…

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

Q: form a confidence interval for mean, proportion, and standard deviation.

A: Confidence interval for mean When sample size &gt; 30 and population standard deviation is…

Q: For a group of 20 students taking a PSDTF test, the mean heart rate was 96 beats per minute, and the…

A: Solution: Let X be the heart rate. From the given information, x-bar is 96 beats per minute, S=5 and…

Q: What is the sample mean? What is the standard deviation?

A: Use EXCEL Procedure for finding the value of sample mean.   Follow the instruction to obtain the…

Q: Use the given degree of confidence and sample data to construct a confidence interval for the…

A: Of 293 employees selected randomly from one company, 8.19% of them commute by carpooling.…

Q: For what type of variable does it make sense to construct a confidence interval about a population​…

A: Qualitative variable: A variable which cannot be measured in numerically is known as a Qualitative…

Q: Among various ethnic groups, the standard deviation of heights is known to be approximately three…

A: