CheckThe mean amount purchased by each customer at Churchill's Grocery Store is $25 with a standard deviation of $9 The population ispositively skewed. For a sample of 41 custormers, answer the following questionsa. What is the likelihood the sample mean is at least $29? (Round the zvelue to 2 decimel places and the final answer to 4 decimalplaces.)Sample meanb. What is the likelihood the sample mean is greater than $23 but less than $29? (Round the zvalue to 2 decimal places and the finalanswer to 4 decimal places.)Sample meanc. Within what limits will 98% of the sample means occur? (Round the final enswers to 2 decimel places.)Sample meanand

For the given data find the required probabilities in (a)(b ) and ( c )

Answered: The mean amount purchased by each…

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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Suppose that you are using independent samples to compare two population proportions. Fill in the blanks. a. The mean of all possible differences between the two sample proportions equals the_______.b. For large samples, the possible differences between the two samplel proportions have approximately a_________distribution.
A sales manager recorded the number of sales made by each of the 300 salespeople working athis chain of furniture outlet stores on a Saturday and created the following table.# Sales (bins) Proportion of salespeople in this bin0 – 3 0.053 – 6 0.156 – 9 0.30 9 – 12 0.3512 -15 0.15a. What is the unit of observation in this sample?b. What is the variable collected?c. Draw and label the histogram for this dataset.d. Which is the modal category?e. Calculate the proportion of the salespeople made 9 or more sales.f. Calculate the number of salespeople who made between 0 and 9 sales.
A manufacturer collected a sample of 56 bolts of cloth from a day's production. Each bolt is carefully inspected and the number of imperfections is recorded in the following table. According to the given table, mean is median is mode is (Round your answer to three decimal places if needed.) Number of imperfections 1 Number of bolts 39 9. 3 3. 2. 5.
During an experiment, the following times (in seconds) were recorded. Find the mean. 6.3, 5.4, 6, 3.2, 5.4, 5.5 ... The mean is (Round to one decimal place as needed.) ...
Jamie’s Intro to Biology professor tells the class that on the first exam, the mean score is a 70, but the median score is an 84. What does this tell you about the skewness of the distribution? What measures of center and spread would you use to describe this distribution? a. The distribution is skewed left, so we should use the mean and the median to describe the distribution. b. The distribution is skewed left, so we should use the median and the IQR to describe the distribution. c. The distribution is skewed right, so we should use the median and the IQR to describe the distribution. d. The distribution is symmetric, so we should use the standard deviation and the IQR to describe the distribution. e. The distribution is skewed right, so we should use the mean and the IQR to describe the distribution.
Bill Alther is a zoologist who studies Anna's hummingbird (Calypte anna). (Reference: Hummingbirds, K. Long, W. Alther.) Suppose that in a remote part of the Grand Canyon, a random sample of six of these birds was caught, weighed, and released. The weights (in grams) were as follows. 3.7 2.9 3.8 4.2 4.8 3.1 The sample mean is = 3.75 grams. Let x be a random variable representing weights of hummingbirds in this part of the Grand Canyon. We assume that x has a normal distribution and σ = 0.64 gram. Suppose it is known that for the population of all Anna's hummingbirds, the mean weight is μ = 4.30 grams. Do the data indicate that the mean weight of these birds in this part of the Grand Canyon is less than 4.30 grams? Use ? = 0.10. (a) What is the level of significance? (Enter a number.) State the null and alternate hypotheses. Will you use a left-tailed, right-tailed, or two-tailed test? H0: μ = 4.3 g; H1: μ > 4.3 g; right-tailed H0: μ < 4.3 g; H1: μ = 4.3 g; left-tailed…
In a psychology class, 40 students have a mean score of 89.5 on a test. Then 24 more students take the test and their mean score is 78.3.What is the mean score of all of these students together? Round to one decimal place.
The histogram below gives the high temperatures for a simple random sample of May, June, and July days. What percent of days are between 70 and 80 degrees? Round your answer to the nearest percent.
Find the mean, median, and mode of the data, if possible. If any of these measures cannot be found or a measure does not represent the center of the data, explain why. The durations (in minutes) of power failures at a residence in the last 5 years are listed below. 15 29 38 59 29 63 81 15 120 48 What is the mean duration? Select the correct choice below and fill in any answer box to complete your choice. O A. The mean duration is minutes. (Round to one decimal place as needed.) B. There is no mean score.
The distances golf balls travel under laboratory testing conditions are normally distributed. The mean is 312 yards. The probability the golf ball travels further than 319 yards is 0.28. Find the probability a randomly selected golf ball travels between 305 yards and 319 yards. Express the answer as a decimal value rounded to the nearest hundredth.

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