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MATLAB: An Introduction with Applications

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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Taula Hmon
a random sample of 115 grocerv store itemekaN taken and of those 8S had prices which ended in 5 or
Find a 95% confidence interval for the trnue population proportion of grocery store items that end n yo
Find the point estimate, and the error bound for the interval. (You may use the 1-PropzAnt fulictn an
calculator).
Point-estimate:
EBP(error bouand):

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Suppose a certain species bird has an average weight of x = 3.2 grams. Based on previous studies we can assume that the weights of these birds have a normal distribution with sigma = 0.34 grams. For a small group of 18 birds , find a 98% confidence interval for the average weights of these birds. Write answer in interval notation with two decimal places.
13. We are curious to see if college students get less sleep than the average person. It is known from previous studies that the average person gets 8 hours of sleep on average with a standard deviation of 1 hour. We surveyed 100 students from LTCC and found that on average they got 7.5 hours of sleep with a standard deviation of 1.5 hours. c) Analyzing the data, we get a 95% confidence interval of (7.206, 7.794). What should our conclusion be? Group of answer choices Reject the null hypothesis since 7.5 is included in the interval Reject the null hypothesis since 8 is not included in the interval Fail to reject the null hypothesis since 8 is not included in the interval Fail to reject the null hypothesis since 7.5 is included in the interval
Mrs. Gallas wanted to estimate the average weight of an Oreo cookie to determine if theaverage weight was less than advertised. She selected a random sample of 30 cookies andfound the weight of each cookie (in grams). The mean weight was = 11.1921 grams with astandard deviation of sx = 0.0817 grams. Make a 95% confidence interval to estimate the truemean weight of an Oreo. 1. What is the formula for calculating the standard deviation of the sampling distribution of x? 2.What condition must be met to use this formula? Has it been met?
Please show how to get the answer but also show how to put into the graphing calculator.
Please show work
10. Suppose we sample 300 UNI students and find the 27 regularly wear a watch. Find a 98% confidence interval for p, the percentage of all UNI students who regularly wear a watch.
A researcher investigated whether the temperature of milk, x, can be used to predict the milk's pH content, y. She predicted the pH level of a glass of milk with a temperature of 8.45 degrees to be ŷ= 6.795 a)A 95% confidence interval for the mean pH of all milk with temperature 8.45 degrees is calculated to be (6.76, 6.83). Which of the following is the correct interpretation of this confidence interval? -The mean pH level for all glasses of milk having a temperature of 8.45 degrees is somewhere between 6.76 and 6.83, with 95% confidence. -The pH level for one glass of milk with a temperature of 8.45 degrees is somewhere between 6.76 and 6.83, with 95% confidence. -There is a probability of 0.95 that the mean pH level for this glass of milk with temperature 8.45 degrees is between 6.76 and 6.83. -95% of all glasses of milk with a temperature of 8.45 degrees have a pH level between 6.76 and 6.83. b)Suppose we have a glass of milk whose temperature is 8.45 degrees. We…
10.Past studies showed that maternal diabetes results in obesity, blood pressure,and glucose tolerance complications in the offspring. Following are thearterial blood pressures, in millimetres of mercury (mm Hg), for a randomsample of 16 children of diabetic mothers. The sample mean is ?̅= 85.99 mm Hg and the sample standard deviation is ? = 8.08 mm Hg (a)Obtain a 95% confidence interval for the mean arterial blood pressure of all children of diabetic mothers. (b)Interpret the confidence interval obtained in part (a). (c)Obtain a 90% confidence interval for the mean arterial blood pressure of all children of diabetic mothers.
Determine whether each statement is true or false. If the statement is false, explain why. 1. In the construction of a frequency distribution, it is not a good idea to have overlapping class limits, such as 10- 20, 20 – 30, 30- 40, etc. 2. Histograms can be drawn by using vertical or horizontal bars. 3. In construction of a frequency polygon, the class limits are used for the x-axis. Select the best answer. 4. What is another name for the ogive? a. Histogram b. Cumulative frequency graph c. Pareto chart d. Frequency polygon 5. What graph should be used to show the relationship between the parts and the whole? a. Ogive b. Pareto chart c. Pie graph d. Histogram Complete the statement with the best answer. 6. Data such as blood types (A, B, AB, O) can be organized into a(n) frequency distribution. Answer the question. 7. When 30 randomly selected eustomers left a convenience store, each was asked the number of items he or she purchased. Construct an ungrouped frequeney distribution for…
Q3. A business man want to decide about the hair-cut prices and so he decided to know the mean time spet on hair-cuts. He has no record of time needed for hair-cut. He wanted a max error of +0.2. He took a sample of size 30 and found that s= 1.5 min. Find the sample size needed to achieve the 95% confidence level.
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