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Q. Example of Selection a Sample?
Ans.
Suppose a presidential election is approaching and many people are interested in knowing which candidate is most likely to win the vote. You have been assigned the task of predicting the future president one month before Election Day. How do you do it?
Solution: Here is one way that you might approach this problem. Use the 4 steps listed above.
1) The objective of this survey is to determine what percent of voters are likely to vote for the republican candidate, the democratic candidate or another candidate.
2) The variable is the way each member of the population chooses to vote. The population is all of the registered American voters.
3) You may decide to randomly dial phone numbers using U.S. area codes until you find 1000 registered voters. Ask them which candidate they plan to vote for.
4) If the sample you have chosen is a good representation of the voting American public, then you might assume that the percentage of voters in your sample who chose to vote republican will be the same percentage of voters in the entire population who will vote republican. You can assume the same for the democratic candidate as well as the other candidates.
The fluctuations in the stock market induce some investors to sell and move their money into more stable investments. To determine the degree to which recent fluctuation affected o
The correlation coefficient can take values from -1 to 1. If the correlation coefficient lies in the range (-1,0) then we say that the correlation is negative, on the other hand if
One measure of the risk or volatility of an individual stock is the standard deviation of the total return (capital appreciation plus dividends) over several periods of time. Altho
1.) Consider two chains R and S, each having 3 and 6 links respectively. Each link's resisting strength is normally distributed with a mean of 60,000 psi and standard deviation of
i)A sionusodial signal has the form x(t) = Asin?t Derive an expression for the autocorrelation Rxx(λ) II) Explain the significance of this result in term of the frequen
i need help it says for the tables of values determine appropriate veiwing window, create a scatter plot, write a function rule, and graph your funtion rule over your scatter plot
03 (a) Explain the term capital rationing and suggest the criteria to be used in ranking projects under capital rationing. (05) (b) There are three projects X Y and Z having follow
assignment.
Stratified Sampling: If the population from which a sample is to be drawn does not constitute a homogenous group, then stratified sampling technique is applied so as to obtain a re
1. What size sample will be needed to construct a 95% confidence interval on a ballot issue if the estimate must be 2% of the actual percent. This issue looks very close in the el
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