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A sample of 300 urban adult residents of a particular state revealed 63 who favored increasing the highway speed limit from 65 to 75 mph, while a sample of 180 rural residents yielded 75 who favored the increase. (HINT: Z Test for Difference in Two Proportions)
Does this data indicate that the sentiment for increasing the speed limit is different for the two groups of residents? Let p1 refer to the urban population.
Inverse probability based on normal distribution - The data set has a bell-shaped distribution. Between what two prices do 68% of the houses lie?
A study regarding the relationship between age and the amount of pressure sales personnel feel in relation to their jobs revealed the following sample information.
At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations.
Assume that for population of students at school, distribution of x is well approximated by normal curve with mean 48 min and standard deviation 4 min.
At the 5% significance level, can the station conclude that the mean age of its listeners is not 25 yrs. Formulate and test the appropriate hypotheses. Use the critical value approach.
Describe the types of probability -example of classical probability, empirical probability, or subjective probability.
In a study designed to determine patientâ??s acceptance of a new pain reliever, 100 physicians each selected a sample of 25 patients to participate in the study.
You want to create a 90% confidence interval for the true average number of yards per game he throws. What is the margin of error for this estimate?
Use the trend equation to calculate the points for 2003 and 2005. Plot them on the graph and draw the regression line.
In a poll to estimate presidential popularity, each person in a random sample of 1000 voters was asked to agree with one of the following statements:
In a recent year Barry Bonds hit 73 home runs in the 153 games he played. Assume that his home run production stayed at that level the following season.
Find out a linear equation in the form P = mt + b (y = mx + b) that gives the population, P, t years from 2010.
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