45 people are randomly selected and the accuracy of their wristwatches is checked, with positive errors representing watches that areahead of the correct time and negative errors representing watches that are behind the correct time. The 45 values have a mean of 113sec.Assume the population standard deviation is known to be 226sec. Use a 0.01 significance level to test the claim that the population of allwatches has a mean of Osec. Give your test statistic to 3 decimal places, and your P-value to at least 4 decimal places. Hint: Is there a directionspecified in the problem statement? What does that tell you about your alternate hypothesis?The test statistic isThe P-Value is

Given : Claim : The population of all watches has a mean of 0 sec.

Answered: 45 people are randomly selected and the…

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 nutritionist wants to determine how much time nationally people spend eating and drinking. Suppose for a random sample of 901 people age 15 or older, the mean amount of time spent eating or drinking per day is 1.85 hours with a standard deviation of 0.57 hour. Complete C and D.
A particular fruit’s weights are normally distributed, with a mean of 395 grams and a standard deviation of 29 grams. The heaviest 18% of fruits weigh more than how many grams? Give your answer to the nearest gram.
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?
The time is takes a studen to walk from the dorn to the chemistry lab follows roughly a Normal distrubtion with a mean of 20 minutes and a stardard deviation of 3 minutes. What porportion of students is faster than 15 minutes when walking from the dorm to the chemistry lab?
The director of research and development is testing a new medicine. She wants to know if there is evidence at the 0.02 level that the medicine relieves pain in more than 346 seconds. For a sample of 58 patients, the mean time in which the medicine relieved pain was 352 seconds. Assume the population standard deviation is 23. Find the P-value of the test statistic. 囲 Tables E Keypad Keyboard Shortcuts 0.0582 %3D IX
The mean for a data set is 61. The standard deviation is 4, and the z-score is -0.34. Find the raw score. What is the raw score? (Type an integer or a decimal.)
A community college Math instructor feels that the average age of community college students decreased since they started teaching 25 years ago. Looking up data from the year the instructor started teaching, the mean age of community college students was 24.3 years old, with a population standard deviation of 2.2 years. The Math instructor took a sample of 40 of their current community college students and found that the sample had a mean age of 23.7 years old. Assume the population of ages of community college students is normally distributed and that the population standard deviation has remained the same. Test at the 5% significance level if the mean age of community college students is now less than 24.3 years old. The question is attached.
A pupil in grade 2 jumped 3.2 m for the long jump. The class mean is 2.5 m with a standard deviation of 0.4 m. A pupil in grade 8 at the same school jumped 4.3 m in a class with a mean of 3.4 m and a standard deviation of 0.5 m. Which student should receive the long jump medal for the school track meet?
Researchers measured the data speeds for a particular smartphone carrier at 50 airports. The highest speed measured was 77.8 Mbps. The complete list of 50 data speeds has a mean of x= 16.56 Mbps. And a standard deviation of s= 35.08 Mbps. What is the difference between carriers highest data speed and the mean of all 50 states. How many standard deviations is that?

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