The manager of a pizza shop finds that the delivery time of pizza to customer follows a normal distributionwith population mean of µ minutes and population standard deviation of 8 minutes. The manager randomlyselects 18 orders and marks down the delivery time (in minutes) as below:131822242424262627282829303031323538(a) Find the sample mean, median and mode of the above data.(b) Find the point estimate of u(c) Another survey will be conducted for the construction of the 99% confidence interval estimate of µ.Find the least number of orders to be selected so that the sampling error of the 99% confidence intervalestimate of u is less than 2.5 minutes.

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Answered: The manager of a pizza shop finds that…

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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Age at diagnosis for each of 20 patients under treatment for meningitis was given in the paper "Penicillin in the Treatment of Meningitis" (Journal of the American Medical Association [1984]: 1870-1874). The ages (in years) were as follows: 4.72 18 18 25 19 23 20 69 18 21 18 20 18 18 20 18 19 28 17 18 18 a. Calculate the values of the sample mean and the standard deviation. b. Compute the upper quartile, the lower quartile, and the interquartile range. c. Are there any mild or extreme outliers present in this data set? d. Construct the boxplot for this data set.
Use the Descriptive Statistics tool to summarize the percent gross profit for the sales data provided. Find the descriptive statistics for the percent gross profit. (Type integers or decimals rounded to two decimal places as needed.) Mean enter your response here % Standard Error enter your response here % Median enter your response here % Mode enter your response here % Standard Deviation enter your response here % Sample Variance enter your response here Kurtosis enter your response here Skewness enter your response here Range enter your response here % Minimum enter your response here % Maximum enter your response here % Sum enter your response here Count Customer Percent Gross Profit1 212 213 224 225 166 227 328 269 3410 2411 1012 3213 2814 5015 2716 317 2218 919 1420 2121…
A math teacher claims that she has developed a review course that increases the scores of students on the math portion of a college entrance exam. Based on data from the administrator of the exam, scores are normally distributed with H = 525. The teacher obtains a random sample of 2200 students, puts them through the review class, and finds that the mean math score of the 2200 students is 530 with a standard deviation of 119. Complete parts (a) through (d) below. C. Yes, because every increase in score is practically significant. D. No, because the score became only 0.95% greater. (d) Test the hypothesis at the a = 0.10 level of significance with n= 400 students. Assume that the sample mean is still 530 and the sample standard deviation is still 119. Is a sample mean of 530 significantly more than 525? Conduct a hypothesis test using the P-value approach. Find the test statistic. to =0 (Round to two decimal places as needed.) %3D Find the P-value. The P-value is (Round to three decimal…
The frequency distribution of scale categories for a 7-point off- flavor scale follows: Category Frequency 1 (none) 75 86 3 93 4 74 5 60 6 36 7 (very strong) 21 1. What is the rational origin of the foregoing 7-point scale? 2. Scale the categories using Guilford's method and interpret the results. Also find Guilford's adjusted scores. Detemine the mean and the standard deviation of the estimated category scale. 3.
Biologists studying the healing of skin wounds measured the rate at which new cells closed a razor cut made in the skin of anesthetized newt. Here are the sorted data from 12 news measured in 2. micrometers per hour (microm/hr): 11 12 18 22 22 23 23 26 29 29 30 31 (a) Using the data compute the sample mean of the healing rates. Include appropriate notation and units. Sample mean: (b) Estimate the sample standard deviation (SD). Include appropriate notation and units. Sample SD: (c) Compute and interpret z-score for the healing rate of 26 microm/hr. z-score = Interpretation:
A sample of size 8 was collected from an unknown population 0 1126 10 11 20 1. Use the table of expected z-scores (rounded to the nearest tenth) below to construct the normality plot with expected z-scores on the x-axis and the observations on the y-axis: 5 -1.2 -0.5 0 0.5 1.2 Clear All Draw: 22- 2 not normal normal 19 # 6 -1.3 -0.6 -0.2 0.2 0.6 1.3 7 -1.4 -0.8 -0.4 0 0.4 0.8 1.4 8 -1.4 -0.9 -0.5 -0.2 0.2 0.5 0.9 1.4 9 -1.5 -0.9 -0.6 -0.3 0 0.3 0.6 0.9 1.5 2. Based on whether the pattern above is linear or not, in your opinion, was the sample drawn from a normal population or not?

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