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Develop a 90% confidence interval for the population mean,µ . Construct a 95% confidence interval for the population mean,µ .
The capability of lizards to recognize their predators via tongue flicks can frequently mean life or death for lizards. Seventeen juvenile common lizards were exposed to the chemical cues of the vip
Starting salaries of 145 college graduates who have taken statistics course have a mean of $43,608 and standard deviation of $8,347.
Employ the given degree of confidence and sample data to develop a confidence interval for the population proportion p.
A researcher wanted to investigate the eject of a special diet on lowering blood pressure. She chose a random sample of 16 adults. 8 of the adults chosen were then chosen at random and put on the di
Determine the minimum sample size you must use to promise that your estimate of p will be within the required margin of error around the population p.
Find out the 95% confidence interval for variance of the heights of maple trees if sample of 26 trees has standard deviation of 10.2 feet.
A report states that 46% of home owners have vegetable garden. How large a sample is required to determine the true proportion of home owners who have vegetable gardens to in 4 percentage points wit
In sample of 55 mice, a biologist found that 42% were capable to run a maze in 30 seconds or less. Determine the 90% limit for the population proportion of mice that can run a maze in 30 seconds or
An experiment was conducted to find out the strength of a certain kind of braided cord after weathering. The strengths of 56 pieces of cord which had been weathered for 30 days were investigated. Th
A study of elephants is conducted to find out the average weight of certain subspecies of elephants. The standard deviation for population is 500 pounds. At an 80% level, how many elephants need to
A researcher conducted study of the access speed of 35 hard drives as well as concluded that his maximum error of estimate was 35. If he were to conduct a second study to decrease the maximum error
A study of 35 professors showed that the average time they spent creating test questions was 13.5 minutes per question. The standard deviation of the population is 3.8.
The average number of years served by those 35 justices was 13.8. If the standard deviation of entire population is 7.3 years, determine the 95% confidence interval for average number of years serve
Employ the information below to determine the expected return upon the stock of W.M. Hung Corporation.
A farmer has decided to employ a new additive to grow his crops. He divided his farm in 10 plots and kept records of corn yield (in bushels) before as well as after using the additive. The results a
A set of 50 data values has the mean of 45 and a variance of 9. Determine the standard score (z) for a data value = 52.
The claim is that the proportion of drowning deaths of children attributable to beaches is more than 0.25, and the sample statistics comprise n = 615 drowning deaths of children with the 30% of them
Age at onset of dementia was estimated for sample of adults between the ages of 60 and 75. For 15 subjects, the results were SX = 1008, and S(X-M) squared = 140.4. Employ this info to answer the fol
An ecologist claims that due to environmental affects, the mean life of Louisiana shellfish is 27 months. Feeling the claim is too low, a congressman decides to test the ecologists claim at a signif
An ecologist claims that because of environmental affects, the mean life of Louisiana shellfish is 27 months. Feeling the claim is too low, a congressman decides to test the ecologists claim at sign