Answered: The positive t values for a 2-tail and…

The positive t values for a 2-tail and a 1-tail [a ‘right’ tail] 90% confidence interval & 43 degrees of freedom are… 2 Tails 1 Tail +1.960 +1.645 +2.017 +1.681 +1.681 +1.302 +1.645 +1.282

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A 95% confidence interval for the true proportion of math students who prefer to use a handheld calculator versus computer software for computations is (0.751, 0.863). Is it reasonable to believe more than 75% of math students prefer to use a handheld calculator versus computer software for computations? Yes, because the entire interval is greater than 0.75. Yes, because the center of the interval is 0.807, which is greater than 0.75. No, because a different sample might give different results. No, because 0.751 is barely greater than 0.75, which is not statistically significant.
10q3r1 (4) Body weight Bench press 148 145 176 148 154 133 189 156 181 166 217 174 210 168 150 139 137 109 151 119 172 138 219 167 142 131 143 119 151 164 136 124 149 147 129 134 219 162 169 140 149 180 187 156 198 149 156 131 220 149 154 138 212 147 122 122 133 163 136 136
The COVID-19 antibodies present were measured and recorded in a sample of healthy adults injected with a placebo (Group 1) and for a sample of healthy adults injected with a COVID-19 vaccine (Group 2). A 96% confidence interval for ul-u2 was computed as follows: (-750 GMT, -550 GMT) Interpret the endpoints of this interval in the context of this problem. Do not use the word "difference" in your answer.
The weekly time (in hours) spent weight lifting for 5 random high school athletes are given below. What is the UPPER bound for a 97% confidence interval for ? What is the LOWER bound for a 97% confidence interval for ? 5.0 7.5 3.3 7.5 4.0
Suppose you take 4 air quality samples in parts per million: 19.6, 1.88, 12.7, 11.9. Give a 90% confidence interval of the mean air quality? (Also, t(0.95,3) = 2.3534 and t(0.90,4)= 1.5332) (a) (3.45, 16.83) (b) (0, 25) (c) (2.93, 20.10) (d) (5.22, 21.54) (e) None of the above
A random sample of n = 246 people who live in a city were selected and 76 identified as a "dog person."A random sample of n2 = 115 people who live in a rural area were selected and 69 identified as a "dog person." Find the 90% confidence interval for the difference in the proportion of people that live in a city who identify as a "dog person" and the proportion of people that live in a rural area who identify as a "dog person." Round answers to to 4 decimal places. pi p2 Next Question
Find the 95% confidence interval for the percentage of leaky diapers in Example 4.4.4 assuming 400 diapers were tested and 20% were leaky. Note that it is 8 percentage points long.
Q4.2) Construct a 95% confidence interval for the true average monthly salaryearned by all employees of People Plus Pty, if it was found that the averagemonthly salary earned by a sample of 19 employees of the company wasR18 500, with a standard deviation of R1 750 What can we do to make the confidence interval narrower in Q.4.2, withoutchanging the confidence level?
A student was asked to find a 90% confidence interval for widget width using data from a random sample of size n = 20. Which of the following is a correct interpretation of the interval (11.5,21.6)? There is a 90% chance that the mean of a sample of 20 widgets will be between 11.5 and 21.6. The mean width of all widgets is between 11.5 and 21.6, 90% of the time. We know this is true because the mean of our sample is between 11.5 and 21.6. With 90% confidence, the mean width of a randomly selected widget will be between 11.5 and 21.6. We are 90% confident the mean width of all widgets is between 11.5 and 21.6. There is a 90% chance that the mean of the population is between 11.5 and 21.6.
find a 95% confidence interval for the true proportion of grapes that are used for raisins if a sample of 340 bins of grapes 25.1% are used for raisins. We are 95% confident the true proportion of grapes used for raisins is between ____ and ———
A trade magazine routinely checks the drive-through service times upper bound of 163.1 seconds. What does this mean? fast-food restaurants. An 80% confidence interval that results from examining 563 customers in one fast-food chain's drive-through has a lower bound of 159.5 seconds and an Choose the correct answer below. O A. One can be % confident that the mean drive-through service time of this fast-food chain is seconds O B. One can be % confident that the mean drive-through service time of this fast-food chain is between seconds and seconds. O C. The mean drive-through service time of this fast-food chain is seconds % of the time. O D. There is a % probability that the mean drive-through service time of this fast-food chain is between seconds and seconds.
Two different researchers measured the weight of two separate samples of ruby-throated hummingbirds from the same population. Each calculated a 95% confidence interval for the mean weight of these birds. Researcher 1 found the 95% confidence interval to be 3.12 g < μ < 3.48 g while Researcher 2 found the 95% confidence interval to be 3.05g < μ < 3.62 g. Why would the two researchers get different answers? Which researcher most likely had the larger sample? Can you be certain about your answer in part (b)? Why or why not?