The police chief selects a sample of 49 local policeofficers from a population of officers with a meanphysical fitness rating of 72 ± 7.0 (u ± o) on a100-point physical endurance rating scale. Hemeasures a sample mean physical fitness rating onthis scale equal to 74. He conducts a one-independentsample z test to determine whether physicalendurance increased at a .05 level of significance.

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Answered: The police chief selects a sample of 49…

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 researcher is interested in examining whether people experience greater traumatic stress after a natural disaster (hurricane) or a man-made tragedy (terrorist attack). The researcher measured the stress of 10 people who experienced a hurricane and 10 people who experienced a terrorist attack. Stress was measured on a scale from 1-5, with higher scores indicating greater stress. Enter their data (see below) into SPSS and answer the following questions. Hurricane Terrorist Attack 3.6 3.0 2.2 3.2 3.6 4.7 2.4 4.7 2.2 4.4 1.0 4.2 1.7 2.0 2.2 3.6 2.7 4.6 1.7 4.4 Run an independent t-test ?
RA company that manufactures car tires wants to compare breaking performance on dry and wet pavements for a brand of their tires. They selected a random sample of 10 sets of tires and put them on 10 cars. The stopping distance (ft) on dry pavement and wet pavement was recoded for each car. The results are summarized in the table below. Car 2. 4 8 9. 10 Dry 152 148 135 130 134 133 128 136 136 157 Wet 202 220 194 146 182 172 201 180 192 204 Do the data provide enough evidence to conclude that the average breaking performance is lower on wet naYement for this tire brand? Use the rejection point method. Use a 0.05.
An ANOVA is used to compare the mean GPA of the following groups of students.
A researcher conducts a study to investigate whether the obesity rate rural communities differ from the obesity rate from the population at large. He gathered a sample of adults from a small community, measured their weight, and compared it to the population average. What statistical test is appropriate for this study and why?
The sample uric acid levels of selected basketball and tennis players of the same age and gender in a certain university were tested. The result is shown below. Is there a difference in the mean uric acid levels between basketball and tennis players? Use a = 0.05. Sample Standard Deviation Group Basketball players Mean 15 4.5 1.0 Tennis players 15 3.4 1.5
The accompanying data represent the miles per gallon of a random sample of cars with a three cylinder 1.0 liter engine
When 20 people were asked to donate for charity, they donated the following amounts. [15, 49, 46, 62, 25, 24, 51, 46, 26, 48, 32, 53, 16, 22, 60, 30, 24, 55, 45, 18] a. Determine the 3rd Quartile value (Q3). c. Determine the 37th Percentile value (P37).
Among applicants to a school of public health, the average GRE writing score was about 3, the SD was about 0.5, and the lowest score was 2.5. True or False: the GRE writing scores follow the normal curve. Select one: True False Brevious page Next page C
In a t-test for paired samples, the one value that compares, for each person, her or his two measurements is called the . Difference score Deviation score Standard deviation Standard difference
The respiratory disturbance index (RDI), which is the number of apneic and hypopneic episodes per hour of sleep, was used as a measure of severity of sleep apnea. An RDI of 5 or more indicates sleep-related breathing disturbances. The RDIs for the females and males samples in a study in US are as follows. Female 0.1 0.5 0.3 2.3 2.0 1.4 0.0 Male 2.6 19.3 1.4 1.0 0.0 39.2 4.1 0.0 2.1 1.1 5.6 5.0 7.0 2.3 4.3 7.5 16.5 7.8 3.3 8.9 7.3 At the 1% significance level, do the data provide sufficient evidence to conclude that the female patients are less suffer than male from the apnea disease?
A successful basketball player has a height of 6 feet 11 inches, or 211 cm. Based on statistics from a data set, his height converts to the z score of 5.17. How many standard deviations is his height above the mean?
Survey was conducted about real estate prices. Data collected is 183237, 273290, 394891, 471556, 505379, 636091, 779283, 895021, 966565, 1012251, 1193014, 1212547, 1359408. What is the 85th percentile price?

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