Example: Compute the 90%, 95%, and 99% confidence intervals for thepopulation mean credit card balances presented in the file Balance.xls.The summary statistics for this data set are as follows: n=85 =5,900s = 3,058b. Using a confidence interval of 95% we want our margin to be within $250,what is the minimum number of people I need to sample?

The summary statistics for the population mean credit card balances is provided as; The confidence…

Answered: Example: Compute the 90%, 95%, and 99%…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Tina catches a 14-pound bass. She does not know the population mean or standard deviation. So she takes a sample of five friends and they say the last bass they caught was 9, 12, 13, 10, and 10 pounds. Find the t and calculate a 95% (α = .05) confidence interval.
Given the following: Sample Mean = 84.3 Population Variance = 144 Sample size = 35 a. Calculate a 90% confidence interval for the mean. Interpret this interval. b. Calculate a 99% confidence interval for the mean. c. Explain the relationship between Confidence Levels and the resulting intervals.
The following sample data are from a normal population: 10,9,12,14,13,11,6,5 c. With 95% confidence, what is the margin of error for the estimation of the population mean (to 1 decimal)? d. What is the 95% confidence interval for the population mean (to 1 decimal)? d.
According to recent data by the American Marketing Association, 76.5%of people in the 18-24 age group used social media in 2017. You want to find out what the social media proportion is among your classmates who are all between 18 and 24 years old. Suppose you obtain a random sample of 229 students and find that 202 students in this sample are active social media users. Complete parts a through c below. a. Construct a 99% confidence interval to estimate the actual proportion of social media users. A 99% confidence interval to estimate the actual proportion has a lower limit of------ and an upper limit of------- (Round to three decimal places as needed.) b. What is the margin of error for this sample? c. Is there evidence that this proportion matches that of the overall population based on the sample?
The following data set is scaled scores from the SAT test in 2018: Student 1: 500 Student 2: 580 Student 3: 450 Student 4: 750 Student 5: 690 Student 6: 800 SAT scores are scaled from 200 to 800 points. How would you best classify this data? a. Cross-sectional Data b. Time Series Data c. Qualitative Data d. Longitudinal Data e. None of these
Need crit value, the pictured question b, and rejection region.
Read the following prompt and complete 3.a and 3.b
When constructing a 90% confidence interval around a sample mean, how many samples out of 100 would you expect to not include the true population mean within their confidence intervals? a. 5 b. 1 c. 0 d. 10
The following are the GPAs of 18 r/s SCC students:1.3, 1.5, 1.7, 2.2, 2.5, 2.6, 2.6, 2.6, 2.6, 2.8, 2.9, 2.9, 3.0, 3.1, 3.5, 3.5, 3.6, 3.9(a) Find the 70th percentile of the data.(b) Find the median and Q1and Q3Make sure you properly justify how to find them.(c)Find all outliers using the IQR method d) Draw the box plot of this data
Use the results from a survey of a simple random sample of 1064 adults. Among the 1064 respondents, 69% rated 13 themselves as above average drivers. We want to test the claim that more than 20 of adults rate themselves as above average drivers. Complete parts (a) through (e). A. No. Assuming quality of driving can be quantified, half of all adults must have driving quality less than or equal to the mean. B. Yes. Assuming quality of driving can be quantified, a distribution that is extremely skewed to the right would be the most promising scenario for more than this proportion of adults to have driving quality that is above the mean. C. Yes. Assuming quality of driving can be quantified, a distribution that is extremely skewed to the left would be the most promising scenario for more than this proportion of adults to have driving quality that is above the mean. O D. No. It is impossible to compare the quality of different adults' driving. b. If we use the same significance level to…
Given a data set with u = 18 and o = 3 find the percent of data within each range: Just type the number in the blank, do not type "%" sign. between 15 and 21 = %3D [ Select ] between 12 and 24 = [ Select ] below 18 [ Select ] between 12 and 21 = [ Select ]

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