Matlab, Fourth Edition: A Practical Introduction to Programming and Problem Solving
4th Edition
ISBN: 9780128045251
Author: Stormy Attaway Ph.D. Boston University
Publisher: Elsevier Science
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Chapter 2, Problem 16E
To determine
To explain:
The instance when the command “length” is used instead of “size” for a
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A population has mean 50 and standard deviation 10.If a random sample of size 25 is taken, find the standard error of the mean.
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Chapter 2 Solutions
Matlab, Fourth Edition: A Practical Introduction to Programming and Problem Solving
Ch. 2 - Prob. 2.1PCh. 2 - Prob. 2.2PCh. 2 - Prob. 2.3PCh. 2 - Prob. 2.4PCh. 2 - Prob. 2.5PCh. 2 - Prob. 1ECh. 2 - Prob. 2ECh. 2 - Prob. 3ECh. 2 - Prob. 4ECh. 2 - Prob. 5E
Ch. 2 - Prob. 6ECh. 2 - Prob. 7ECh. 2 - Prob. 8ECh. 2 - Prob. 9ECh. 2 - Prob. 10ECh. 2 - Prob. 11ECh. 2 - Prob. 12ECh. 2 - Prob. 13ECh. 2 - Prob. 14ECh. 2 - Prob. 15ECh. 2 - Prob. 16ECh. 2 - Prob. 17ECh. 2 - Prob. 18ECh. 2 - Prob. 20ECh. 2 - Prob. 19ECh. 2 - Prob. 21ECh. 2 - Prob. 22ECh. 2 - Prob. 23ECh. 2 - Prob. 24ECh. 2 - Prob. 25ECh. 2 - Prob. 26ECh. 2 - Prob. 27ECh. 2 - Prob. 28ECh. 2 - Prob. 29ECh. 2 - Prob. 30ECh. 2 - Prob. 31ECh. 2 - Prob. 32ECh. 2 - Prob. 33ECh. 2 - Prob. 34ECh. 2 - Prob. 35ECh. 2 - Prob. 36ECh. 2 - Prob. 37ECh. 2 - Prob. 38ECh. 2 - Prob. 39ECh. 2 - Prob. 40ECh. 2 - Prob. 41ECh. 2 - Prob. 42ECh. 2 - Prob. 43ECh. 2 - Prob. 44ECh. 2 - Prob. 45ECh. 2 - Prob. 46ECh. 2 - Prob. 47E
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- During the 2017-2018 flu season, a random sample of 180 hospitalizations related to flu was studied. It was later determined that 19 patients have died. A similar study during the 2018-2019 flu season revealed that in a random sample of 180 hospitalized cases related to flu, there were 16 deaths observed. At 5% significance level, test the claim that the percentage of deaths in 2017-2018 is greater than the percentage of deaths in the 2018-2019 season. Procedure: Two proportions Z Hypothesis Test Assumptions: (select everything that applies) Normal populations Population standard deviation are unknown but assumed equal The number of positive and negative responses are both 10 or more for each sample Paired samples Population standard deviation are unknown Sample sizes are both greater than 30 Simple random samples Population standard deviations are known Independent samples Step 1. Hypotheses Set-Up: Ho: Select an answer H: Select an answer ?~ Step 2. The significance level a = 96…arrow_forwardIn hypothesis testing, a Type I error is:A. Failing to reject a false null hypothesisB. Rejecting a true null hypothesisC. Choosing the wrong statistical testD. A computational rounding errorarrow_forwardA 95% confidence interval for a mean is (10, 16). Which statement is correct?A. There is a 95% probability the population mean lies between 10 and 16.B. 95% of the sample data lie between 10 and 16.C. If we repeat the sampling procedure many times, ~95% of such CIs will contain the true mean.D. The true mean is definitely 13.arrow_forward
- In a two-sample t-test comparing means of independent samples, which assumption is NOT required?A. The two samples are independentB. Each population is normally distributed (or n large)C. Observations within each sample are independentD. Population variances must be equal for Welch’s t-testarrow_forwardYou draw repeated random samples of size 30 from any population with finite mean and variance. The sampling distribution of the sample mean will approximately be:A. UniformB. BinomialC. Approximately normal (by CLT)D. Highly skewed regardless of original distributionarrow_forwardWhich distribution is appropriate for modeling the count of events occurring in a fixed interval when events happen independently at a constant average rate?A. Normal distributionB. Binomial distributionC. Poisson distributionD. Exponential distributionarrow_forward
- A researcher tests whether a new drug changes blood pressure. The null hypothesis H0H0 is “no effect.” A p-value of 0.03 was obtained. Which is correct at α = 0.05?A. Fail to reject H0H0B. Reject H0H0 — evidence drug has an effectC. Accept H0H0D. Results are inconclusive because p-value must be <0.01arrow_forwardWhich statistic would you use to test whether categorical variables A and B are independent?A. ANOVA F-statisticB. Pearson chi-square testC. Paired t-testD. Linear regression coefficientarrow_forwardA 95% confidence interval for a mean is (10, 16). Which statement is correct?A. There is a 95% probability the population mean lies between 10 and 16.B. 95% of the sample data lie between 10 and 16.C. If we repeat the sampling procedure many times, ~95% of such CIs will contain the true mean.D. The true mean is definitely 13.arrow_forward
- Which statistic would you use to test whether categorical variables A and B are independent?A. ANOVA F-statisticB. Pearson chi-square testC. Paired t-testD. Linear regression coefficientarrow_forwardIn a two-sample t-test comparing means of independent samples, which assumption is NOT required?A. The two samples are independentB. Each population is normally distributed (or n large)C. Observations within each sample are independentD. Population variances must be equal for Welch’s t-testarrow_forwardA manufacturer claims that the mean life of their bulbs is 1200 hours with a standard deviation of 100 hours.A sample of 25 bulbs has a mean life of 1170 hours.Test the claim at a 5% significance level.arrow_forward
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