Answered: The values associated with a two-sided…

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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Total plasma volume is important in determining the required plasma component in blood replacement therapy for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of an individual. Suppose that a random sample of 40 male firefighters are tested and that they have a plasma volume sample mean of x = 37.5 ml/kg (milliliters plasma per kilogram body weight). Assume that o = 7.10 ml/kg for the distribution of blood plasma. When finding an 99% confidence interval, what is the critical value for confidence level? (Give your answer to two decimal places.) (a) Find a 99% confidence interval for the population mean blood plasma volume in male firefighters. What is the margin of error? (Round your answers to two decimal places.) lower limit upper limit margin of error (b). What conditions are necessary for your calculations? (Select all that apply.) n is large the distribution of volumes is normal o is unknown the distribution of volumes is uniform…
Will your flight get you to your destination on time? To the right are a histogram and summary statistics for the percentage of delayed arrivals each month from 2001 thru 2006. Consider these data to be a representative sample of all months. There is no evidence of a time trend. (The correlation of Flights Delayed % with time is r=0.0160.016.) n= 72 x= 24.5556 s= 3.34564 a) Check the assumptions and conditions for inference about the mean. Select all that apply. A. All of the assumptions and conditions for inference about the mean are met. B. The 10% condition is not met. C. The randomization condition is not met and the sample is not suitably representative. D. The independence assumption is not met. E. The nearly normal condition is not met. b) Find a 99% confidence interval for the true percentage of flights that arrive late. ___ < (Delayed Flight)< ___ (Round to two decimal places as needed.) c) Interpret this interval for a traveler planning to fly. Choose the…
John wants to know whether a common prescribed drug does improve the attention span of students with attention deficit disorder (ADD). He knows that the mean attention span for students with ADD who are not taking the drug is 2.3 minutes long. His sample of 12 students taking the drug yielded a mean of 4.6 minutes. John can find no information regarding σx, so he calculated s² x =1.96 a. Identify the independent and dependent variables. b. In a sentence, state the null hypothesis being tested. c. Using symbols, state the null and alternative hypotheses. d. Determine the critical regions using a one-tailed test with alpha = .05.
A researcher is curious about the association between the association between the number of hours that a student slept the night before the exam and exam score. The appropriate statistical test would be an: a. regression b. independent-samples t-test c. Pearson Correlaation Coefficient d. z test
A researcher is interested in testing the relationship between height and weight in a sample of 100 people. The sample Pearson's r is calculated to be 0.7. What can the researcher conclude about the relationship between height and weight?
The post-lunch dip is the drop in mental alertness after a midday meal. Does an extract of the leaves of the ginkgo tree reduce the post-lunch dip? Assign healthy people aged 18 to 40 years to take either ginkgo extract or a placebo pill. After lunch, ask them to read seven pages of random letters and place an X over every e. Count the number of misses per line read. M. K. Pawlik, "The effect of ginkgo biloba on the post-lunch dip and chemosensory function," MS thesis, Purdue University, 2002. What is a placebo and why was one group given a placebo? A placebo is a treatment pill that is presented to the individuals as a control treatment. A placebo is a lower-strength version of the pill that allows researchers to account for any physiological effect of taking the pill. O A placebo is an inert pill that allows researchers to account for any psychological effect of taking the pill. A placebo is a different pill that allows researchers to account for any variational effect of taking the…
Which plot indicates a correlation of 0.7? A R 8 8 in 10 A
A random experiment consists of throwing 4 equal coins, if X is the number of stamps:a. What is the dispersion of X?
A researcher asked a group of 11 children to report on a 7-point Likert scale how sociable they feel first thing in the morning (low scores indicate not very sociable, high score indicate very sociable). The data in the frequency table below were obtained. The means is: Score 7 1 1 4 2 3 2 2. 1. N = 11 O 1.00 O 1.57 O 4.00 O 2.00 6.
d. There is a 30% chance that X is above what value? X= (Type an integer or decimal rounded to two decimal places as needed.)
3.4.2 2. Find the following z-scores: a. Za10 b. Zo975 c. Z,005 0.15 e. Z30 "0.80 f. Z 0.30
Anyone who has been outdoors on a summer evening has probably heard crickets. Did you know that it is possible to use the cricket as a thermometer? Crickets tend to chirp more frequently as temperatures increase. This phenomenon was studied in detail by George W. Pierce, a physics professor at Harvard. In the following data, x is a random variable representing chirps per second and y is a random variable representing temperature (°F). x 19.8 15.3 20.4 18.1 16.2 15.5 14.7 17.1 y 89.4 73.2 95.3 86.1 78.8 75.2 69.7 82.0 x 15.4 16.2 15.0 17.2 16.0 17.0 14.4 y 69.4 83.3 79.6 82.6 80.6 83.5 76.3 (b) Verify the given sums Σx, Σy, Σx2, Σy2, Σxy, and the value of the sample correlation coefficient r. (Round your value for r to three decimal places.) Σx = Σy = Σx2 = Σy2 = Σxy = r = (c) Find x, and y. Then find the equation of the least-squares line = a + bx. (Round your answers for x and y to two decimal places. Round your answers for a and…

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The values associated with a two-sided 90% of the Student’s t distribution and 21 degrees of freedom are A. ± 1.721 B. ± 1.96 C. ± 1.319 D. ± 2.96