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One article describes measurements of ammonium concentrations (in mg/L) at a large number of wells in the state of Iowa. These included 349 alluvial wells and 143 quaternary wells.
Clearly state the null and the alternative hypotheses. Perform the hypothesis test at level ? = 0.01 by computing the test statistic and the p- value.
A gasoline tank for a certain car is designed to hold 15 gallons of gas. Suppose that the actual capacity of a randomly selected tank has a distribution that is approximately normal with a mean of 1
Below are three sets of expected frequencies for the four cells of 2 X 2 contingency tables. Identify which statistical procedure would be appropriate for each, using the most conservative approach.
Using alpha = 0.05, test whether or not there is a significant difference between the preferences for the two candidates. Use alpha = 0.05.
The following data presents test scores on a Behavioral Vignettes Test for self-help skill teaching for the primary parents of a random sample of families with mentall retarded children before and a
Develop a 90% confidence interval estimate for the difference between the proportion of voters favoring each candidate. Does your confidence interval provide conclusive evidence that one of the candid
What is the minimum sample size required by this student, given that no prior estimate of the population proportion is available?
Use appropriate words and statistics to describe the statistical results. Based on this data which design should he use?
Run the Chi-Square test for independence using the calculator provided in the module. Note that StatCrunch does NOT support this type of Chi-Square.
The 2010 Chevrolet Camaro with an eight-cylinder engine and automatic transmission has a combined gas mileage of 19 mpg. What percent of all vehicles have better gas mileage than the Camaro?
Assume that the average full time college student in the U.S. requires a total of $10,500 per year to cover the costs of tutition, books and fees with a standard deviation of $1,300. If 50 full time
A research organization wanted to estimate the average number of hours a college student sleeps per night during the school year. After randomly sampling 159 college students, the research organizat
According to the central limit theorem what should the theoretical mean and standard deviation be for each of these sample sizes?
What are the appropriate null and alternative hypotheses to test whether the mean for population 2 is larger that that for population 1.
Assuming that the time interval includes the left limit and all the times up to but not including the right limit, estimate the probability that an inventor has a good idea during the time interval
Suppose you are conducting a study with a total of 50 participants from five different regions of the country, and you want to determine if the average blood pressure is different among these groups
Suppose the level of confidence decreases. What would happen to the width of the confidence interval? Stay the same, increase or decrease?
What is the probability that the student will successfully earn exactly the required minimum score of 70% on the exam based solely upon randomly guessing the answer for each question?
A researcher hypothesizes that the variation in the amount of money spent on business dinners is greater than the variation of the amount of money spent on lunches. The variance of nine business din
What is the standard deviation for the number of girls for this distribution? Round your answer to one place value more than the given data and attach units.
Find the 80th percentile for the average of these 49 marathons. (Round your answer to two decimal places.) Find the median of the average running times.
A manufacturer claims the average life of a product is 500 hours. The lifetime of the product is assumed to follow an exponential distribution. What is the probability that the product will last les
What does a negative correlation statistic value mean?
In a random sample of 5 parts on an assembly line, the probability that one of the parts is defect is 15% and follows a binomial distribution. What is the probability of no parts being defective?