5. An enzyme concentration in a certain human population is normally distributed withstandard deviation of 4. Based on sample size of 9 and H0: µ<25, at sig. level of 0.1 whichof the following sample means leads to rejection of the null hypothesis when it is true27.523.524.525.521.5

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Answered: 5. An enzyme concentration in a certain…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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26.Do men take more time than women to get out of bed in the morning? The 48 men observed averaged 7.2 minutes to get out of bed after the alarm rang. Their standard deviation was 1.1. The 45 women observed averaged 6 minutes and their standard deviation was 2.5 minutes. What can be concluded at the αα = 0.10 level of significance? For this study, we should use Select an answer t-test for a population mean t-test for the difference between two dependent population means t-test for the difference between two independent population means z-test for the difference between two population proportions z-test for a population proportion The null and alternative hypotheses would be: H0:H0: Select an answer p1 μ1 Select an answer = < ≠ > Select an answer p2 μ2 (please enter a decimal) H1:H1: Select an answer μ1 p1 Select an answer = > < ≠ Select an answer p2 μ2 (Please enter a decimal) The test statistic ? z t = (please show your answer to 3 decimal places.) The…
The ages of a group of 149 randomly selected adult females have a standard deviation of 16.5 years. Assume that the ages of female statistics students have less variation than ages of females in the general population, so let σ=16.5 years for the sample size calculation. How many female statistics student ages must be obtained in order to estimate the mean age of all female statisticsstudents? Assume that we want 90% confidence that the sample mean is within one-half year of the population mean. Does it seem reasonable to assume that the ages of female statistics students have less variation than ages of females in the general population? Question content area bottom Part 1 The required sample size is enter your response here.
For a sample of 49 items from a normally distributed population for which the standard deviation is a-49.0, the sample mean is 230. At the 1% level of significance, testing Ho U-220 versus Hp>220 Determine the p-value for the test OA. 2.04 B. 0.0207 OC. 0.0764 OD. 0.0414 E. 0.9793
7. A sample of size N= 123 adults randomly selected, spent 8.20 hr/ week on the internet with a standard deviation of 6=9.84 hr. Construct a Confidence Interval of 95% for the population mean U the population mean hours for the internet ?
The ages of a group of 156 randomly selected adult females have a standard deviation of 17.4 years. Assume that the ages of female statistics students have less variation than ages of females in the general population, so let σ=17.4 years for the sample size calculation. How many female statistics student ages must be obtained in order to estimate the mean age of all female statistics students? Assume that we want 98% confidence that the sample mean is within one-half year of the population mean. Does it seem reasonable to assume that the ages of female statistics students have less variation than ages of females in the general population?
A population has parameters u = 239.9 and o = 18.4. You intend to draw a random sample of size n = 76. What is the mean of the distribution of sample means? What is the standard deviation of the distribution of sample means? (Report answer accurate to 2 decimal places.)
1. The strength of steel wire made by an existing process is normally distributed with a mean of 1550 and a standard deviation of 170. A batch of wire is made by a new process, and a random sample consisting of 25 measurements gives an average strength of 1316. Assume that the standard deviation does not change. Is there evidence at the 1% level of significance that the new process gives a larger mean strength than the old? To answer this question, the null hypothesis could be stated as A. μ= 1550 psi B. μ> 1550 psi C.µ + 1550 psi D. μ< 1550 psi
10) A county is considering raising the speed limit on a road because they claim that the mean speed of vehicles is greater than 40 mi/hr. A random sample of 15 vehicles has a mean speed of 43 mil/hr and a standard deviation of 4.4 mi/hr. Assume that speeds follow a normal distribution. What statistical test should be used to test the claim? (pick one of the options) 1. t-test 2. 2.73 3. 15 4. 10.9 5. 14 6. z-test 7. 2.52 8. 2.64 Calculate the value of standardized test statistic. (pick one of the options) 1. t-test 2. 2.73 3. 15 4. 10.9 5. 14 6. z-test 7. 2.52 8. 2.64 What is the degree of the freedom for the distribution of the test statistics. (pick one of the options) 1. t-test 2. 2.73 3. 15 4. 10.9 5. 14 6. z-test 7. 2.52 8. 2.64
2. Traces of toxic, man-made hexachlorohexanes in North Sea sediments were extracted by a known process and by two new procedures, and measured by chromatography. Method Concentration found Conventional Procedure A (pg/g) 34.4 42.9 Standard deviation (pg/g) 3.6 1.2 Number of replications 6 6 a.) Is the standard deviation for procedure A significantly different from that of the conventional procedure at 95% confidence level? b.) Is the mean concentration found by procedure A significantly different from that of the conventional procedure at 95% confidence level?
Suppose test scores can range from 0 to 200 and follow an (approximately) Normal distribution with mean 115 and standard deviation o = 25. Ho: µ = 120 and the alternative Ha: uz 120. A class of 30 students had a mean score of 117. a. What is the value of the test statistic z? b. What is the P-value? С. Would you reject or fail to reject the null at the 5% significance level? Why?

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5. An enzyme concentration in a certain human population is normally distributed with standard deviation of 4. Based on sample size of 9 and H0: u<25, at sig. level of 0.1 which of the following sample means leads to rejection of the null hypothesis when it is true 27.5 23.5 24.5 25.5 21.5