YTACTICE A study was conducted to analyze the relationship between bone density (ing/cm?) and tobacco consumption ("light" or "heavy" smoker).Results were as follows:##sdgroup mean## 1 light 0.79 0.11 15## 2 heavy 0.75 0.16 15nAssume that bone density is normally distributed.a)Calculate an 80% confidence interval for the true mean bone density of the lightsmoker group.b) Is there enough evidence to suggest that heavy smokers have a lower measure forbone density than light smokers? To answer the question, conduct a hypothesistest with a = .05. (Use df = 25.)c)Write out in words what a Type 2 error would in this situation. (Use the language ofthe problem: bone density, smoking, etc.)

a) The formula for Confidence Interval estimation is: μ = M ± t(sM) where: M = sample meant = t…

Calculate an 80% confidence interval for the true mean bone density of the light a) smoker group. Is there enough evidence to suggest that heavy smokers have a lower measure for bone density than light smokers? To answer the question, conduct a hypothesis test with a = .05. (Use df = 25.) b) c) Write out in words what a Type 2 error would in this situation. (Use the language of the problem: bone density, smoking, etc.)

Calculate an 80% confidence interval for the true mean bone density of the light a) smoker group. Is there enough evidence to suggest that heavy smokers have a lower measure for bone density than light smokers? To answer the question, conduct a hypothesis test with a = .05. (Use df = 25.) b) c) Write out in words what a Type 2 error would in this situation. (Use the language of the problem: bone density, smoking, etc.)

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

A researcher is interested in assessing if there are differences in the average number of monthly religious event attendances across religious affiliations. Religious event attendance is measured as an interval-ratio variable: it is the number of events that each survey respondent reported attending in the previous month. Religious affiliation is measured as a nominal variable with the following categories: Protestant, Catholic, Jewish, Muslim, Hindu, Buddhist, other, and not religious. Which of the following hypothesis tests would be appropriate, given the types of variables presented? O Chi-square test O Two-sample difference-of-proportions z-test O ANOVA O One-sample difference-of-proportions z-test
A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 3 points with 99% confidence assuming s=17.8 based on earlier studies? Suppose the doctor would be content with 99% confidence. How does the decrease in confidence affect the sample size required? a. A 99% confidence level requires _______ subject. b. 90% confidence level requires ________ subject. c.How does the decrease in confidence affect the sample size required? a.Decreasing the confidence level decreases the sample size needed. b.Decreasing the confidence level increases the sample size needed. c.The sample size is the same for all levels of confidence.
Physicians say that the normal temperature of a person's body is about 37 degrees Celsius. In a class, the temperatures (in degrees Celsius) of 10 students were collected: 36.8 36.6 37.5 36.7 37.1 37.3 37 37.1 37 36.9 What is the point estimate for the population's average body temperature? Given that s = 0.3 and using a 99% level of confidence, what is the maximum error (1 decimal place)? What is the lower limit(one decimal place only) of the interval estimate using the 99% confidence level?
If the mean speed for a major league fast ball is 90 miles per hour and the standard deviation is 5 miles per hour, what would the standardized score be for a pitch that is 97 miles per hour? O 0.4 4.0 1.4 O 1.0
Consider the data from the Anthropology 105 class. The mean for women is 64.33 in and the standard deviation is 2.64 in. The average height of men in the US is approximately 5ft 10in. What proportion of women represented here are shorter than the average man?
Need helop with this question. Thank you :)
may i know the answer??????????
A magazine provided results from a poll of 500 adults who were asked to identify their favorite pie. Among the 500 respondents, 13% chose chocolate pie, and the margin of error was given as ±4 percentage poits. Describe what is meant by the statement that "the margin of error was given as ±4 percentage points." (...) Choose the correct answer below. OA. The statement indicates that the study is only 4% confident that the true population percentage of people that prefer chocolate pie is exactly 13%. OB. The statement indicates that the study is 100% -4% = 96% confident that the true population percentage of people that prefer chocolate pie is 13%. OC. The statement indicates that the interval 13% ± 4% is likely to contain the true population percentage of people that prefer chocolate pie. D. The statement indicates that the true population percentage of people that prefer chocolate pie is in the interval 13% ± 4%.
Discuss the difference between the 95% and 99% confidence levels. What are the corresponding alpha levels and how confident is the researcher in the results? Edit View Insert Format Table 12pt ✓ | P ▸ Paragraph B IU A ✓T²✓ 岬くく描く To B √x www 11 ✓
Now suppose that the true mean exposure time is different from 8h/day, yet the sample mean falls in the acceptance region. In this case we would fail to reject H0 when it is false. This type of wrong conclusion is called a A. type II error B. type I error C. no error D. statistically significant
Most people think that the "normal" adult body temperature is 98.6°F. In a more recent study, researchers reported that a more accurate figure may be 98.1°F. Furthermore, the standard deviation appeared to be around 0.7°F. Assume that a Normal model is appropriate. b) What fraction of people would be expected to have body temperatures above 98.6°F?
60% of students entering four-year colleges receive a degree within six years. Is this percent smaller than for students who play intramural sports? 128 of the 220 students who played intramural sports received a degree within six years. What type of test should you use? A) z-test for population mean B) z-test for population proportion C) t-test for population mean