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Researcher wants to estimate in $300 true average amount of money country spends on road repairs each year. If she wishes to be 90% confident, how large sample is essential? Standard deviation is known to be $900.
Researcher is interested in testing whether there are differences in mean between population one and population two.
To be 99% sure that we will not be late in completing the project, what is the requested completion time in work-days?
Assume a random sample of 16 gasoline stations is selected and their mean cost for regular gasoline is computed. What is the standard error of the mean in this experiment?
Forecast the number of deliveries utilizing exponential smoothing constant for different values also compare it. A hospital records the number of floral deliveries its patients receive every day.
Determine: SS(xy)Linear correlation coefficient, r. Bar graph below compares mean time in seconds for 7-yr old girls to complete certain task.
Testing equality of variances - evidence of a difference in the variability of monthly talking time on cell phones for men and women?
Assume that p-value was 0.07, would you reject null hypothesis of equal mean rates for a Type- I error rate of 5%? (Circle one).
A quadratic revenue function often occurs in practice. The reason is that as more units are produced, the price must be lowered in order to sell them all.
What internal and external threats are and could you provide some examples of what would be considered a threat to internal and/or external validity of a study design.
Give a probability distribution for the following: In 1992, the Big 10 collegiate sports conference moved to have women compose at least 40% of its athletes within 5 years.
Revenue and cost functions for producing and selling quantity x for certain production facility are given below. Find out profit function P(x).
Design a contingency table that will hold your data. What are your degrees of freedom and critical value at a 0.05 confidence level? You do not need data to answer this.
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