14th Edition

ISBN: 9780134685045

Author: BERENSON

Publisher: PEARSON

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Chapter 9, Problem 18PS

If, In a sample of n = 16 selected from a normal population, X ¯ = 56 and S = 12 , what is the value of t S T A T if you are testing the null hypothesis H 0 : μ = 50 ?

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Chapter 9, Problem 17PS

Chapter 9, Problem 19PS

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Suppose it was determined that the percentage of t's in the English language in the 1800s was 9%. A random sample of 1000 letters from a current newspaper contained 109 t's. Test the hypothesis that the proportion of t's has changed in modern times, using the 0.05 level of significance. Treat the newspaper as a random sample of all letters used. State the null and alternative hypotheses. O A. H,: p 0.09 O B. H,: p= 0.09 HA: p#0.09 OC. Hg: p#0.09 HA: p= 0.09 O D. Ho: p> 0.09 Ha: p 0.09 Determine the z-test statistic. z= (Round to two decimal places as needed.) Find the p-value. p-value = (Round to three decimal places as needed.) Choose the correct conclusion. O A. Do not reject Hg. The proportion of t's is significantly different from 0.09. O B. Do not reject Hn. The proportion of t's is not significantly different from 0.09. OC. Reject H. The proportion of t's is significantly different from 0.09. O D. Reject H,. The proportion of t's is not significantly different from 0.09.

A researcher administers a treatment to a sample of n=36 selected from a population with u=30 and o=2. If the sample mean after treatment is M=32, then Cohen’s d=1.00. True or False?

A random sample of n=4 individuals is selected from population with µ = 35, and a treatment is administered to each individual in the sample. After treatment, the sample mean is found to be M= 40. 1 with SS= 48. a. How much difference is there between the mean for the treated sample and the mean for the original population?(note: In a hypothesis test, this value forms the numerator of the t statistic.) b. If there is no treatment effect, how much difference is expected between the sample mean and its population mean? That is, find the standard the standard error for M. (note: in a hypothesis test, this value is the denominator of the t statistic.) c. Based on the sample data, does the treatment have a significant effect? Use a two-tailed test with α=.05.

Chapter 9 Solutions

BASIC BUSINESS STATISTICS-STUD.SOLN.MAN

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If, In a sample of n = 16 selected from a normal population, X ¯ = 56 and S = 12 , what is the value of t S T A T if you are testing the null hypothesis H 0 : μ = 50 ?

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