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A random sample of the price of gasoline from 40 gas stations in a region gives the statistics below. Complete parts a) and b). ybar = $3.79, s = $0.27
a) Find a 95% confidence interval for the mean price of regular gasoline in that region. ( __, __ ) (Round to three decimal places as needed.)
b) If we had the same statistics from a sample of 80 stations, what would the 95% confidence interval be now?(__, __) (Round to three decimal places as needed.)
Use a one-factor ANOVA to test the null hypothesis that population abundance is equal among these 6 species. Be sure to interpret your results and explain your reasons for declaring them significant or not significant. Use either Bartlett's test o..
a shareholders group in lodging a protest claimed that the mean tenure for a chief executive office was at least nine
She has 95% confidence that the mean annual income of the 2 million customers is between $70,000 and $85,000. Explain the meaning of the statement.
A bank manager has developed a new system to reduce the time customers spend waiting for teller service during peak hours. The manager hopes that the new system will reduce waiting times from the current 9 to 10 minutes to less than 6 minutes.
A company that produces an expensive stereo component is considering offering a warranty on the component. Suppose the population of lifetimes of the components is a normal distribution with mean of 84 months and standard deviation of 10 months.
Use data visualization techniques (graphical plotting) to see what the data will tell you - calculate correlations among the portfolio, SH, and RWM.
Assume that the van der Waals equation of state (P + a/v2)(v - b) = RT gives the correct Kelvin temperature T. Use the van der Waals equation of state to derive an expression that relates the difference T - Θ to P and v.
in basketball a players free throws percentage ft is expressed as a number between 0 and 1 which represents the
1. how do correlation coefficients summarize the information in scatter-plot? what do scatter-plots reveal that
Construct the 95% confidence interval for the proportion of students with at least one injury.
urn 1 has five white and seven black balls. urn 2 has three white and twelve black balls. we flip a fair coin. if the
the mean of sample a is significantly different than the mean of sample b. sample a 59 48 74 62 87 73 sample b 53 67 78
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