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Use the data to find a point estimate of the population mean weight of fire ants. What estimator did you use? Use the data to find a point estimate of the population variance. What estimator did you u
What is the probability that student from this class will pass (NOT fail)
Jean Researcher is studying the percentage of ethanol in DWI arrestees's blood. She tests 16 subjects and finds a mean 1.8% with a standard deviation of .2%
A population has a variance of 34. What is the standard deviation of this population ? ( 2 decimal places).
The IRS randomly selected 2950 tax returns for audit and discovered that 1900 of them had serious errors. The sample is larger so that sample classical confidence interval for p may be used below.
Suppose weights of the checked baggage of airline passengers follow a nearly normal distribution with mean 46 pounds and standard deviation 3.1 pounds. Most airlines charge a fee for baggage that we
A local lawn service has determined the average time it takes to mow an average residential yard is thirty-five minutes. If mowing times are independent and constant, what is the probability it will
Find the 95% confidence interval for the variance of the weights of containers of motor oil if a sample of 14 containers has a variance of 3.2. Assume the variable is normally distributed.
For Binomial distribution with n = 10 and probability of success p = 0.4 find probability of less than 3 successes (x < 3) (3 is not included).
Find the 90% confidence interval for the standard deviation for the time it takes an inspector to check a bus for safety if a sample of 27 buses has a standard deviation of 6.8 minutes. Assume the v
A researcher is interested in estimating the average salary of police officers in a large city. She wants to be 99% confident that her estimate is correct. If the standard deviation is $1050, how la
The weights of professional baseball players follow a normal distribution with a mean of 200 pounds and a standard deviation of 25 pounds. Find the probability that a randomly selected professional
The average time it takes college freshmen to complete the Mason Basic Reasoning Test is 38.3 minutes. The standard deviation is 3.2 minutes. Assume the variable is normally distributed. Find the pr
The invoices are numbered from 0001 to 5000. Complete the list of the 10 invoice numbers that will be selected from the simple random sample below.
What are the hypotheses? Identify the test statistic. Identify the P-value. Identify the critical values?
A researcher is studying the relationship between earnings for major electronic firms and research and development expenditures in the previous year. A random sample of 15 major electronic firms is
How large a sample should be taken if the population mean is to be estimated with 90% confidence to within $79? The population has a standard deviation of $908.
Professor Fair believes extra time does not improve grades on exams. He randomly divided a group of 300 students into two groups and gave them all the same test. One group had exactly 1 hour in whic
Seventy-four respondents gave accurate answers. Assume that the samples are representatives of the general population. Test the claim that there is a difference in the proportion of accurate respons
Use the analysis of variance with _ _ 0.05 to determine whether there is a difference among these three brands of batteries. Suppose you are asked to make a recommendation regarding the batteries base
Suppose we are interested in the proportion of left handed statistics student and we take a sample to estimate the percent of student in our class who are lef handed
For the data set below, if you were to fit a regression equation, what would the value of R2 be, to two decimals? Hint: Recall that R2 is related to the correlation value r in simple linear regressi
Suppose that for a set of numeric data, we have the following sample statistics:
A sample of 24 of 172 funded projects revealed that 17 were valued at $17,200 each and 7 were valued at $20,480 each. From the sample data, estimate the total value of the funding for all the projec