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Concern over the weather associated with ElNino has increased interest in the possibility that the climate on earth is getting warmer. The most common theory relates an increase in atmospheric levels of carbon dioxide (co2),a greenhouse gas, to increases in temperature. A regression analysis of the mean annyal co2 concentration in the atmosphere at the top of Mauna Loa in Hawaii (in parts per million) and the man annual air temperature over both land and sea across the globe (in degress C) for 44 years was performed. Assume all conditions are met for a simple linear regression inference.
R-squared = 32.1%
s=0.075
a) Calculate the t-statistic for this problem.
b) How many degrees of freedom for the t-statistic problem have?
Caculate the expected value of the profit made by the insurance company. Many call this kind of situation a win win opportunity for the insurance company and the promoter. Do you agree? Explain.
To exercise your skills, you are to perform the following using different tools available to you (e.g. Excel spreadsheet, graphing calculator, etc.) and write and explanation on your findings:
The value of the standardized test statistic
the random variable x has a binomial distribution with parameters p0.20 and p0.156. use an appropraite distribution to
Election officials take a random sample of 100 signatures and thoroughly investigate them to find that 84% are valid. Is this statistically significant evidence that the candidate has enough valid signatures overall? Explain.
A certain firm specializing in the manufacture and sale of free time clothing has 80 retail stores in Florida and 140 in California. With each state as a stratum, the firm wishes to estimate average sick-leave time per employee for the past year
the probability that a person owns a car pcar 0.80 that a person owns a boat pboat 0.30 and that a person owns both a
Conduct a hypothesis test to determine if the average cardiac outputs measured by the two evaluators differ. Use a significance level of 0.02.
Compute the mean, standard deviation, median, and standard error for each group.
shown here are the data for y and three predictors x1 x2 and x3. a multiple regression analysis has been done on these
the distribution of a population of mechanical aptitude test is normal with a mean of 46 and a standard deviation of 4.
Which of the 4 methods of data collection is involved when a person counts the number of cars passing designated location on the Los Angeles freeway system?
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