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Q1) Random sample of n = 121 sales invoices was taken from very large population of such invoices, and average value was found to be $47.50 with sample standard deviation of $7.50. Determine a 90% confidence interval for mean value of all invoices. Compare this interval with that obtained under simplifying assumption that population standard deviation is equal to sample standard deviation.
Random sample of 10 flights from Amsterdam to Paris yields following flight-times (in minutes):
44 43 44 35 40
40 39 42 36 37
Find out a 95% confidence interval for μ, and use this to explain the conjecture that flying from Amsterdam to Paris takes on average 42 minutes. Test this conjecture with formal hypothesis test, by using a 5% significance level. Find out the p-value for hypothesis test.
The study does not give sufficient evidence to support the claim that less than 75% of college students spend less than $250 per semester on textbooks.
Develop percent frequency distribution and construct bar chart and pie chart.
Utilizing a binominal experiment, that is each trail can be reduced to two outcomes, construct a binomial distribution.
Write down the probability of that the median of the sample or average medians is greater or more than 320 minutes?
For each lettered part, a through c, examine the two given sets of numbers. Without doing any calculations, decide which set has the larger standard deviation and explain why. Then check by finding the standard deviation by hand .
A study group of long distance phone calls made from the corporate offices of Pepsi Bottling Group, Inc., in Somers, New York, revealed the length of the calls, in minutes, follows normal probability distribution.
At the .05 significance level, can we conclude that the guideline is still reasonable?
Give all steps of a test of the hypothesis that the corresponding population proportions are equal.
You will investigate four different scenarios of population growth also decline in this town. Graph the model as well as investigate it by four different growth models.
College Students' Seating Choices and Motivation to Achieve.This activity is a revision of an activity found in Real Data: A Statistics Workbook Based on Empirical Data by Z. C Holcomb (1997). Published by Pyrczak Publishing.
When combining probabilities, to find the probability of one event AND another event, the separate probabilities should be:
Find the probability that exactly 15 flights arrive on time.
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