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Establish the mean and median.
Consumer Review posts reviews and ratings of a variety of products on internet. The following is a sample of 20 speaker systems and their ratings (www.audioreviews.com). The ratings are on a scale of 1 to 5, with 5 being the best
Speaker
Rating
Infinity Kappa 6.1
4
Allison One
4.12
Cambridge Ensemble II
3.82
Dynaudio Contour 1.3
Hsu Rsch. HRSW12V
4.56
Legacy Audio Focus
4.32
Mission 73li
4.33
PSB 400i
4.5
Snell Acoustics D IV
4.64
Thiel CS1.5
4.2
ACI Sapphire III
4.67
Bose 501 Series
2.14
DCM KX-212
4.09
Eosone RSF1000
4.17
Joseph Audio RM7si
4.88
Martin Logan Aerius
4.26
Omni Audio SA 12.3
2.32
Polk Audio RT12
Sunfire True Subwoofer
Yamaha NS-A636
2.17
a. work out the mean and the median.
b. calculate the first and third quartiles.
c. figure the standard deviation
d. The skewness of this data is -1.67. Comment on the shape of the distribution.
e. What are the z-scores associated with Allison One and Omni Audio?
f. Do the data contain any outliers? Describe
Construct ogive cure and numerical measures for the discrete data.
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No, there is not enough information to refuse hypothesis that proportion of male students who live on campus and proportion of female students who live on campus are same as the test value -1.65 is inside acceptance region (-1.96,1.96).
Create the corresponding decision tree and make recommendations.
First explain what the Gini coefficient is and what hypothetical Gini values of 0 and 1 mean. Sort the data by the Gini coefficient in 2000 and look at the list of countries.
Construct a 95 percent confidence interval for the true mean.
Heights of 18-year-old men are approximately normally distributed, with mean 68 inches and standard deviation 3 inches.
Determine the percent of the days is the price between $38.00 and $40.00?
A bank official reported the results of a regression analysis designed to predict the bank's charges (y), measured in dollars per month, for services rendered to local companies.
At.01 significance level, is there difference in mean number of times men and women order take-out dinners in month? Determine the p -value?
What is the probability of receiving more than three pieces of junk mail today?
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