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A real estate agent wants to compare the variation in the selling price of homes on the oceanfront with those 3 blocks away A sample of 21 oceanfront homes sold within the last year revealed the standard deviation of the selling prices was 45,600. A sample of 18 homes also sold within the last year, that were one to three blocks from the ocean revealed that the standard deviation was 21,330. At the .01 significance level, can we conclude that there is more variation in the selling prices of the oceanfront homes?
What does central limit theorem say about distribution of John's average payoff after 365 bets in a year?
Design a Huffman source coding scheme that can achieve lossless transmission with lessthan 90 bit/second.
If writing scores for population have standard deviation of σ = 20, does sample give adequate evidence to conclude that new composition course has significant effect?
A random sample of 16 students selected from the student body of a large university had an average age of 25 years and a standard deviation of 2 years.
In a two-tailed test, with n = 20, the computed value of t is found to be t* = 1.85. Assuming the sample is randomly selected from a normal population, then the p-value is given by:
In the FBI promotion system, last year's decoration points had a standard deviation equivalent to 7.1. This year 27 of the tested individuals had scores with a standard deviation of 4.2.
The box plots below show the real estate values of single values of single family homes in two neighboring cities, in thousands of dollars.
Can we conclude from this that most workers there earn between $25 and $35 per hour? Is this the right interpretation for the margin of error?
Standard deviation was increased to 40, determine the overall effect on their society? Would this change be a good thing?
Is there a difference in the extent of wound healing by treatment? (Hint: Are treatment and the percent wound healing independent?) Run the appropriate test at a 5% level of significance.
Assume that the length X in minutes of a regular season NBA game is normally Distributed with X~N (µ X , σ 2 X );
For each of the following three scenarios, state which hypothesis test you would use from among the four introduced so far: the z test, the single-sample t test, the paired-samples t test, and the independent-samples t test.
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