Answers:1. a) χ2 = 4.112, do not reject H0: gender and age of contracting the disease are independent; b) χ2 = 14.03, reject H0: the data do not support the researcher's beliefs; c) χ2 = 2.068, do not reject H0: it appears that this belief is not supported (there is no evidence to suggest that the belief is correct). 1. A hospital keeps a record of the number of males and females in different age groups who contract a particulardisease. The data are summarized as follows:Age Groups10-25MaleFemale26-40 41-55 56 +232034 6431 552944a) Are gender and age of contracting the disease independent of one another (a ≤.05)?b) A researcher believes that people in the 41-55 age group are three times as likely to develop the disease as arethose in each of the two younger age groups, while those in the 56 + age group are only twice as likely (relative tothose in the two youngest groups). The two youngest age groups are not expected to differ from each other. Do thedata support these beliefs (a ≤.01)?c) It is also believed that, relative to males, the proportion of females in the 56 + age group that develops thedisease is significantly different from the proportion of females in the 10-25 age group that develops the disease.Test this belief with a ≤.05.

The chi-square test is a statistical measure used to test the independence groups. The given…

1. A hospital keeps a record of the number of males and females in different age groups who contract a particular disease. The data are summarized as follows: Age Groups 10-25 26-40 41-55 56 + Male Female 23 20 34 64 31 55 29 44 a) Are gender and age of contracting the disease independent of one another (a ≤.05)?

1. A hospital keeps a record of the number of males and females in different age groups who contract a particular disease. The data are summarized as follows: Age Groups 10-25 26-40 41-55 56 + Male Female 23 20 34 64 31 55 29 44 a) Are gender and age of contracting the disease independent of one another (a ≤.05)?

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

3) For population standard deviation = 3 and a population mean = 10, find the z scores for the following x: A) x = 11 B) x = 8 C) x = 19 D) x = 2
G m1 chip - Google Search É 13-inch MacBook Pro - Space .austincc.edu/webapps/assessment/take/launch.jsp?course_assessment_id=_756751_1&course_id=_846.. Question Completion Status: QUESTION 4 Is the following an observational study or an experiment? Take a random sample of people at a fitness center. Ask them if they use resistance bands or not. Compare the average muscle mass for those who do and those who do not use resistance bands. O Observational Study O Experiment QUESTION 5
The average farm size in the United States is 444 acres. A random sample of 40 farms in Oregon indicated a mean size of 430 acres, and the population standard deviation is 52 acres. At a = 0.05, can it be concluded that the average farm in Oregon differs from the national average? a) Based on reading the problem, how do we know we are working with a hypotheses test ( Ho and H1)? This question has two possible answers. U Asks us to find (estimate) the % confidence interval of the population (true) mean. DAsks us to find the sample size (how many or how large). Oa is provided. Asks if there is evidence r can we conclude somethine
7. Weight losses of 12 persons in an experimental one-week diet program are given below: 3.0 5.3 0.2 Weight Loss in Pounds 0.2 3.7 3.7 -1.2 5.9 2.0 1.4 1.7 3.6 Do these results indicate that a mean weight loss was achieved? ( m, > 0) (Perform a hypothesis testing with a = 0.05).
6) Suppose you had the following body temperature readings, all in °F: (Don't forget to answer the questions in parts (d) and (e)). 96.21 97.65 97.39 97.97 97.28 99.43 a) calculate the mean, variance and standard deviation. b) now convert these readings to °C (us biologists like the metric system, after all). To convert, remember that °C = °F/1.8 - 32/1.8. For example, to convert the first reading you would do: 96.21/1.8 - 32/1.8 = 53.43 - 17.78 = 35.67. c) now calculate the mean, variance and standard deviation of the converted data. d) take the mean you calculated in (a) and convert this to Celsius using the same formula you used in (b). Are you surprised by the results? Why or why not? e) take the standard deviation from (a) and divide it by 1.8. Can you explain the results? Why didn't you have to subtract 32/1.8? Watch your math in this step!
The driving distance was recorded for each Harper student in a sample of 30. A 95% confidence interval for μμ is (13, 28) miles.a) The individual object in the study was a randomly selected _____. This is computer-graded so use exact wording from the problem above. b) What was the variable information recorded for each object in the study? This is computer-graded so use exact wording from the problem above. c) State the statistical interpretation of the confidence interval in the context of this problem. the driving distance of Harper students is/are between and d) What is the symbol and value of the point estimate for μμ? = milese) What is the margin of error for the given interval? milesf) Fill in the boxes below to show the relation on the number line between the numeric values of the point estimate and the interval estimate for μμ. <--------A--------------B--------------C--------> A = B = C =
An automobile parts supplier owns a machine that produces a cylindrical engine part. This part is supposed to have an outside diameter of three inches. The technical staff feels that the mean diameter produced by the machine is off target. In order to verify this, a special study will randomly sample 40 parts produced by the machine. The 40 sampled parts will be measured, and if the results obtained cast a substantial amount of doubt on the hypothesis that the mean diameter equals the target value of three inches, the company will assign a problem-solving team to intensively search for the causes of the problem. Formula the hypotheses so that the problem-solving team will be assigned when the null hypothesis is rejected. A sample of 40 parts yields a sample mean diameter of 3.006 inches. Assume that the population standard deviation equals 0.016 inches. (1) Use the critical value approach to test H0 versus Ha when α = 0.05. (2) Use the p-value approach to test H0 versus Ha when α =…
The level of dissolved oxygen in a river indicates the water’s ability to support aquatic life. A research project is started to determine if the oxygen levels in the river have changed. A study done 10 years prior, showed that the mean oxygen levels in milligrams per liter for the river was 4.3. A.) Write appropriate hypotheses for this test B.) Water is collected samples from 15 randomly chosen locations along the river and measured the dissolved oxygen. Construct and interpret a 95% confidence interval for the mean dissolved oxygen level for this stream. The results are in milligrams per liter: 4.53 5.5 4.01 5.04 4.83 4.66 3.29 4.4 2.87 5.23 5.42 5.73 4.13 6.38 5.55 C.) Based on the sample from part B, conduct a significance test of these results using a 5% significance level. Give complete results of the test including a p-value and what the results means.
p = proportion of graduates who get a jobA published article indicates that only 1 in 3 university graduates have a job waiting for them. In an investigation of 200 recent graduates of university A, it was found that 51 had a job. Can it be concluded, with a level of significance of 0.01, that from this university the proportion of graduates who have a job is lower? Choose 1. the correct conclusion2. the correct interpretationSelect one: a) 1. H0 is rejected2. It can be ensured, with 99% confidence, that less than a third of the graduates of said university get a job. b) 1. H0 is not rejected2. It can be ensured, with 99% confidence, that less than a third of the graduates of said university get a job. c) 1. H0 is not rejected2. There is not enough evidence to consider, with 99% confidence, that less than a third of the graduates of said university get a job. d) 1. H0 is rejected2. There is not enough evidence to consider, with 99% confidence, that less than a third of the graduates of…
5. a). What is a fundamental difference between the t statistic and a z-score in terms of variability? b). What value is estimated with a confidence interval using the t statistic?
Consumer Reports stated that the meantime for a Chrysler Concorde to go from 0 to 60 miles per hour in 8.7 seconds. If you want to set up a statistical challenge to claim the average time from 0 to 60 miles per hour is not equal to 8.7 seconds, what would be the alternate hypothesis and type of test? H1: μ≠ 8.7, a right-tailed test b)H1: μ≠ 8.7, two-tailed test c) H1: μ≠ 8.7,left-tailed test
In the past, the mean running time for a certain type of flashlight battery has been 9.6 hours. The manufacturer has introduced a change in the production method and wants to perform a hypothesis test to determine whether the mean running time has decreased as a result. A hypothesis test is to be performed. Determine the null and alternative hypotheses. A. H0: µ ¥ 9.6 hours and H1: µ = 9.6 hours B. H0: µ = 9.6 hours and H1: µ ¥ 9.6 hours C. H0: µ = 9.6 hours and H1: µ > 9.6 hours D. H0: µ = 9.6 hours and H1: µ < 9.6 hours