fast-food
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A: 1. Hypothesis will change as alternate hypothesis will be considered less than now.
A fast-food establishment has been averaging about $2000 of business
per weekday. To see whether business is changing due to a deteriorating
economy (which may or may not be good for the fast-food industry),
management has decided to carefully study the figures for the next 8 days.
Suppose the figures are
2050, 2212, 1880, 2121, 2205, 2018, 1980, 2188
(a) What are the null and the alternative hypotheses?
(b) Are the data significant enough, at the 5 percent level, to prove that
a change has occurred?
(c) What about at the 1 percent level?
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- An organization monitors many aspects of elementary and secondary education nationwide. Their 2000 numbers are often used as a baseline to assess changes. In 2000, 23% of students had not been absent from school even once during the previous month. In the 2004 survey, responses from 7792 randomly selected students showed that this figure had slipped to 22%. Officials would be concerned if student attendance were declining. Please refer to the following images:1. Government data shows that 11% of the population is victimized by property crime each year. A random sample of 408 older citizens (ages 65+) shows a victimization rate of 15%. Are older people more likely to be victimized? a. State the null and research hypotheses. b. Calculate the test statistic. c. What do you decide? Why?4. Students in Miss Bigelow's English class completed a vocabulary test worth 100 points, and, interestingly, all students received different scores on this test. When Miss Bigelow summarized the test scores, she obtained the following: Minimum = 25 points, Q, = 59 points, Median = 78 points, Q3 = 87 points, and Maximum = 100 points. If Kami's score on this test is at the 40th percentile, what does this mean? A. Kami's test score is between 25 points and 59 points. B. Kami's test score is between 59 points and 78 points. C. Kami's test score is between 78 points and 87 points. D. Kami's test score is between 87 points and 100 points. E. Kami had a higher test score than 60% of her classmates.
- What is the P-value for the following scenario? A survey of 280 women 18-24 years old in 2000 found that 42.5% lived with their parents, while a similar survey of 270 women in 2012 found that 47.8% lived with their parents. Is there enough evidence to conclude that the proportion of women living with their parents was greater in 2012? Use a 5% significance level. As in Chapter 7, answers need to be correct to three decimal places beyond the first non-zero digit.1. An educational researcher says that the proportion of college students who study for their statistics final exam is 68%. Write the claim, null and alternative hypotheses for this statement. Draw a distribution to represent it, and then identify the type of test (tail) that should be used.frisi wants to check the support of political parties in the Reykjavík area and decided to stand at the entrance of Kringlan one weekend and ask people what they are going to vote for. It was Kringlukast and a lot of good offers so many made their way there this weekend. Iris received a total of 834 answers to the question, what are you going to vote for in the upcoming election? "What is the main statistical problem with Iris' survey? 1. It is not corrected for placebo effect. 2. There is a risk of research bias in the survey. 3. There is a risk of sampling in the survey. 4. The number of participants is small and therefore the hypothesis tests that will be performed will have little strength. Assume that the time it takes to run the New Year's race follows a normal distribution with an average of 50 minutes and a standard deviation of 10 minutes. Questions 10 and 11 deal with the New Year's race. Question 10 Lalla sadly, runners who do not finish the race in less than 60 minutes feel…
- Explain this statement below in at least one paragraph 1. "Being a statistician is not having to be certain," "Uncertainty - something you can always count on," and "statistics: stability from variability" 2. What does specifying the null hypothesis and alternative hypothesis refer to? Why is it important to specify the hypotheses?4. Along with interest rates, life expectancy is a component in pricing financial annuities. Suppose that you know that last year average life expectancy was 77 years for your annuity holders. Now you want to know if your clients this year have a longer life expectancy, on average, so you randomly sample n=20 of your recently deceased annuity holders to see actual age at death. Using a 5% level of significance, test whether or not the new data shows evidence of your annuity holders now live longer than 77 years, on average. The data below are the sample data (in years of life): (78,75,83,81,81,77,78,79,79,81,76,79,77,76,79,81,73,74,78,79) a) Does this sample indicate that life expectancy has increased? Test an appropriate hypothesis and state your conclusion (use a 5% level of significance). Be sure to check the necessary assumptions and conditions before conducting your test. b) Construct A 90% confidence interval for the true average age of death for the population of your annuity…13. The sign of the alternative hypothesis in a two-tailed test is always A. C. greater than D. less than equal B. not equal 14. This hypothesis states that there is no difference between population parameters and the hypothesized value. A. hypothesis B. alternative hypothesis C. null hypothesis D. two-tailed hypothesis 15. "The ratings given by male and female students with regard to the online teaching skills of their teachers is the same." This statemen example what kind of hypothesis? A. one-tailed hypothesis B. alternative hypothesis C. null hypothesis D. two-tailed hypothesis 16. "The use of social media as modern approach of advertising will increase the demand for a new product." This is an exam __hypothesis. A. Mean B. null C. alternative D. two-tailed 17. Which is the correct alternative hypothesis for one-tailed test? A. µ = 25 B. µ # 25 C.µ ≥ 25 D. p < 25 18. Mrs. Nazareth conducted a research on the preference of residents of Mayapa in choosing their venue for occasions.…
- 4. Describe the process of statistical inference.For the situation described below, state the null hypothesis, Ho, and the alternative hypothesis, H, to be tested. (Enter != for # as needed.) A statistical test is designed to show that the proportionp of defectives has decreased below 0.6%. Ho: 0.6 H: 0.6Professor Nord stated that the mean score on the final exam from all the years he has been teaching is a 79%. Colby was in his most recent class, and his class’s mean score on the final exam was 82%. Colby decided to run a hypothesis test to determine if the mean score of his class was significantly greater than the mean score of the population. α = .01. What is the mean score of the population? What is the mean score of the sample? Is this test one-tailed or two-tailed? Why?
