A random sample of 10 secretaries was asked to type a certain memorandum using both computers and typewriters, and the time required to finish the task was recorded for each secretary. A test of hypothesis will be conducted to determine if there is enough evidence to conclude that the average time required to type a certain memorandum is faster if female secretaries are using computers rather than typewriters using a 5% level of significance. What is the appropriate null hypothesis? a)The average time required to type a certain memorandum is less than or equal to if female secretaries are using computers rather than typewriters. b)The average time required to type a certain memorandum is lesser if female secretaries are using computers rather than typewriters. c)The average time required to type a certain memorandum is greater if female secretaries are using computers rather than typewriters. d)The average time required to type a certain memorandum is different if female secretaries are using computers rather than typewriters

A random sample of 10 secretaries was asked to type a certain memorandum using both computers and typewriters, and the time required to finish the task was recorded for each secretary. A test of hypothesis will be conducted to determine if there is enough evidence to conclude that the average time required to type a certain memorandum is faster if female secretaries are using computers rather than typewriters using a 5% level of significance. What is the appropriate null hypothesis? a)The average time required to type a certain memorandum is less than or equal to if female secretaries are using computers rather than typewriters. b)The average time required to type a certain memorandum is lesser if female secretaries are using computers rather than typewriters. c)The average time required to type a certain memorandum is greater if female secretaries are using computers rather than typewriters. d)The average time required to type a certain memorandum is different if female secretaries are using computers rather than typewriters

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section: Chapter Questions

Problem 8CR

See similar textbooks

Similar questions

What is meant by the sample space of an experiment?
Researchers conducted a study to determine if an emotional sales pitch would yield a different result than a purely informational sales pitch when persuading potential customers to sign up for a streaming service. They randomly assigned two groups of potential customers to receive either the emotional sales pitch or informational sales pitch. The table below shows the proportion of individuals in each group who signed up for the service. State the appropriate null and alternative hypotheses for this scenario and conduct the appropriate Chi Square test. Use a Chi Square critical value of 3.841. Informational Emotional Subscribed 8 20 Did not subscribe 32 20
Small-business telephone users were surveyed 6 months after access to carriers other than AT&T became available for wide-area telephone service. Of a random sample of 368 users, 92 said they were attempting to learn more about their options, as did 37 of an independent random sample of 116 users of alternative carriers. Test, at the 5% significance level against a two-sided alternative, the null hypothesis that the two population proportions are the same.
An institute conducted a clinical trial of its methods for gender selection. The results showed that 492 of 897 babies born to parents using a specific gender-selection method were boys. Use the sign test and a 0.1 significance level to test the claim that the method increased the likelihood of having a boy. Find the null and alternative hypothesis. H0:H0: p>0.5p>0.5 p<0.5p<0.5 p=0.5p=0.5 p≠0.5p≠0.5 H1:H1: p>0.5p>0.5 p<0.5p<0.5 p=0.5p=0.5 p≠0.5p≠0.5 If we consider + to represent a boy, then how many of each sign is there? Positive Signs: Negative Signs: Total Signs: What is the p-value? (Round to three decimal places.) What is the conclusion about the null? Select an answer Support the null hypothesis. Fail to support the null hypothesis. Fail to reject the null hypothesis. Reject the null hypothesis. What is the conclusion about the claim? Select an answer The sample data contradicts the claim, so we cannot support the claim. Support the claim…
A study is performed involving two therapies for people unable to walk from severe pain due to arthritis. In the study, 300 individuals were randomly given one of two therapies. Specifically, 125 were given Therapy A and 175 were given Therapy B. A total of 88 of the 300 individuals were able to walk with little to no pain, 32 from Therapy A group and 56 from Therapy B group. A significance test was performed for the following hypotheses resulted in a p-value of 0.1150: H0: Walking rates are the same for Therapy A and BHa: Therapy B has a greater walking rate Part A: Interpret the p-value in terms of the context. Part B: Using a significance level of α = 0.05, what can you conclude from the context of this study? Part C: Based on your conclusion in part B, which type of error—Type I or Type II—could have been made? What is one potential consequence of this error?
In a study of 420 comma 116 cell phone users, 128 subjects developed cancer of the brain or nervous system. Test the claim of a somewhat common belief that such cancers are affected by cell phone use. That is, test the claim that cell phone users develop cancer of the brain or nervous system at a rate that is different from the rate of 0.0340% for people who do not use cell phones. Because this issue has such great importance, use a 0.005 significance level. Identify the null hypothesis, alternative hypothesis, test statistic, P-value, conclusion about the null hypothesis, and final conclusion that addresses the original claim. Use the P-value method and the normal distribution as an approximation to the binomial distribution. Which of the following is the hypothesis test to be conducted? A. Upper H 0 : p equals 0.00034 Upper H 1 : p less than 0.00034 B. Upper H 0 : p greater than 0.00034 Upper H 1 : p equals 0.00034 C. Upper H 0…
In 2002, NCHS reported that 75% of children age 2-17 saw a dentist in the past year. An investigator in Boston decided to assess the dental services for children in that area. A sample of 125 children age 2-17 were surveyed and 64 reported seeing a dentist. Assuming that the sample size is adequate, use the five-step hypothesis testing procedure to determine if there is a significant difference in the proportion of children living in Boston who use dental services as compared to the national proportion.
A well-known brokerage firm executive claimed that at least 90% of investors are currently confident of meeting their investment goals. An XYZ Investor Optimism Survey, conducted over a two week period, found that in a sample of 800 people, 88% of them said they are confident of meeting their goals. What would be our formal conclusion about the null hypothesis at a 0.05 significance level?