Question 4[20 marks)(a) A lecturer claims that students in Economy dass put more hours studying compared toother students. The mean numbers of hour spent studying per week is 24 hours with astandard deviation of 3.5 hours per week. A sample of 35 Economy class students wasselected at random and the mean number of hours spent studying per week was foundto be 25 hours. Detemine the lecturer's claim can be accepted at 5% significance level.(b) Abu packs sweets and sell them in a packet of 100g each. Twelve randomly selectedpackets of sweets are taken and their weights in grams are recorded as follows:98100 94969795100102101 97103 99Perform the required hypothes is test at 5% significance level to check whether the meanweight per packet of sweets is not equal to 100g.

Answered: Image /qna-images/answer/6bafb808-7050-4759-9219-075ae9999f5a.jpg

Answered: Question 4 (20 marks] (a) A kecturer…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Q3. In a study, 21 seniors (> 65 years old) were assigned to either a Yoga group (to take Yoga classes for six months) or to Walking group (to exercise by walking regularly over six months). At the end of the six months, the physical fitness of the individuals was measured on a scale 0-100. The data are summarized below Group Мean Standard deviations Sample size Yoga 71.5 0.02 10 Exercise 70.5 0.03 11 a. Using alpha=0.02 and a p-value approach, test the hypothesis that yoga is better than exercise. b. Test the hypothesis that Yoga group has average score that exceeds 70 c. Test the hypothesis that the scores of the two groups have the same variance
Suppose that the amount of sleep college students get per night has a symmetric, bell shaped distribution with mean 6.9 hours and standard deviation of 1.7 hours. (a) Between what two amounts of sleep do the middle 68% of students get? (b) What value is the 97.5th percentile? (c) What percent of values fall between 6.9 hours and 10.3 hours? (d) Would three hours of sleep be an unusual amount? Explain.
For a 4-unit class like Statistics, students should spend average of 12 hours studying for the class. A survey was done on 27 students, and the distribution of total study hours per week is bell-shaped with a mean of 14 hours and a standard deviation of 2.7 hours. spendi. Use the Empirical Rule to answer the following questions. a) 68% of the students spend between hours and hours on Statistics each week. b) 95% of the students spend between hours and hours on Statistics each week. c) 99.7% of the students spend between hours and hours on Statistics each week. Submit Question 65°F A DDO dele ort sc 144 & 8. 6.
Given that the researcher wants to be sure the mean difference in the change in hemoglobin levels has a margin of error no more than 0.2 g/dL and the difference in the stand deviation between the mean hemoglobin levels for the two forms of iron supplements used to treat anemia is 1.2 g/dL, what is the desired number of recruits for the study, assuming the individuals will participate in a crossover trial, if the study’s attrition rate is expected to be .25? Group of answer choices n = 139 n = 554 n = 185 n = 55,320
Suppose a English lecturer believes that there is no significant difference between the average class scores of his two classes, mekar and mawar on final exam. The average and standard deviation for class mekar of 35 students were 75.86 and 16.91.The average and standard deviation for calss mawar of 37 students were 75.41 and 19.73.Using these results, test the claims at 5% level of significance.
Suppose that water usages in American showers are normally distributed, with an average shower using 20 gallons, and a standard deviation of 3.2 gallons. Estimate the percentage of showers that used (a) between 13.6 and 26.4 gallons. % (b) more than 26.4 gallons. % (c) less than 10.4 gallons. % (d) between 16.8 and 29.6 gallons. %
A study was designed to investigate the effects of two variables - (1) a studentʹs level of mathematical anxiety (2) teaching method - on a studentʹs achievement in a mathematics course. Students who had a low level of mathematical anxiety were taught using the traditional expository method. These students obtained a mean score of 290 with a standard deviation of 50 on a standardized test. Assuming no information concerning the shape of the distribution is known, what percentage of the students scored between 190 and 390? Group of answer choices At least 68% At least 95% At least 75% At least 88.9%
For a 4-unit class like Statistics, students should spend average of 12 hours studying for the class. A survey was done on 29 students, and the distribution of total study hours per week is bell-shaped with a mean of 14 hours and a standard deviation of 3.3 hours.Use the Empirical Rule to answer the following questions.a) 68% of the students spend between ? hours and ? hours on Statistics each week.b) 95% of the students spend between ? hours and ? hours on Statistics each week.c) 99.7% of the students spend between ? hours and ? hours on Statistics each week.
Suppose that you want to test the hypothesis that mothers with low socioeconomic status (SES) deliver babies whose birthweights are lower than “normal” at the 5% significance level. To test this hypothesis, you want to conduct a study in which you collect data from full-term live-born deliveries from various maternity wards of hospitals in low SES areas. It is assumed that the standard deviation of birthweights is 24 oz. A national survey has shown that “normal” birthweight is 120 oz. You want to consider being able to detect differences of 5 oz, 10 oz, or 15 oz below normal birthweight. You decide to construct a power curve for each one of these differences where you look at power as a function of sample size. These three power curves are provided below. 1. Match each curve with its correct label regarding birthweight differences (5, 10, or 15 oz). 2. What is the standardized effect size if the difference of interest is 10 oz below normal birthweight?
A researcher is interested in examining the effect of emotions on those that are convicted of a crime while under the age of 15. She decides to compare the empathy quotient (EQ) scores of those convicted of violent crimes to those convicted of non-violent crimes. A random sample of 35 violent offenders had a mean score of 33.5 and a standard deviation of 3.2, and another sample of 46 non-violent offenders had a mean of 37 and a standard deviation of 3.8. Also, suppose that equal variance cannot be assumed, but the populations are normal. If a higher EQ score indicated increased empathy, construct a 95% confidence interval for the difference in means. What is the critical value? What is the lower bound of the confidence interval? What can she conclude about the difference in empathy between the two groups?

Recommended textbooks for you

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

Probability and Statistics for Engineering and th…

Statistics

ISBN:

9781305251809

Author:

Jay L. Devore

Publisher:

Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…

Statistics

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

Probability and Statistics for Engineering and th…

Statistics

ISBN:

9781305251809

Author:

Jay L. Devore

Publisher:

Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…

Statistics

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

Elementary Statistics: Picturing the World (7th E…

Statistics

ISBN:

9780134683416

Author:

Ron Larson, Betsy Farber

Publisher:

PEARSON

The Basic Practice of Statistics

Statistics

ISBN:

9781319042578

Author:

David S. Moore, William I. Notz, Michael A. Fligner

Publisher:

W. H. Freeman

Introduction to the Practice of Statistics

Statistics

ISBN:

9781319013387

Author:

David S. Moore, George P. McCabe, Bruce A. Craig

Publisher:

W. H. Freeman

SEE MORE TEXTBOOKS