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A record executive is interested in the popularity of her label's newest band, The Standard Deviations. She asks 10 people how many Standard Deviations songs they know. Her data are:
0
3
4
5
7
10
12
15
We can use the bar graph to represent the above frequency distribution by taking 'values' along x axis and 'frequency' along y-axis in excel.
Describe the distribution of scores in your sample.
a. Positively skewed
b. Negatively skewed
c. Normally distributed
d. Bimodal
what is the required sample size is the error is to be less than 1/2 hour with a 95% level of confidence?
A researcher was interested in determining whether incentives affect the response rate in surveys. A simple random sample of 50 adult residents of a large city was selected. All were mailed a survey and promised a check upon returning a completed ..
At the 5% level of significance, does this result support the conjecture?
Experience has shown that radon gas level is approximately normally distributed for this population.
The weight of a product is normally distributed with a standard deviation of .5 ounces. What should the average weight be if the production manager wants no more than 5 percent of the products to weight more than 5.10 ounces.
Now compute the standard deviation for this distribution.
It was reported that 20 readers responded and 87% said "no" while 13% said "yes." Recognize 4 major flaws in this survey.
Carry out test of independence to find out whether employee health insurance coverage is independent of size of company. Use α = 0.05 level of significance.
Determine the standard error of students that favoured the move.
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds.
Linear programming problems. Computethe following linear programming problem. Among which of the following points (X,Y) is feasible.
Questions based on binomial distribution, variance of the binomial distribution, discrete random variable and continuous random variables.
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