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Normal population has a mean of 75 and a standard deviation of 5. You select a sample of 40. Compute the probability the sample mean is:
Determine the decision rule? Calculate SST, SSE, and SS totals. Calculate an ANOVA table. Describe your decision regarding the null hypothesis.
Throughout October the average temperature of Whitman Lake is 53.2 and standard deviation is 2.3. Suppose the variable is normally distributed. For randomly chosen day in October, determine the prob
Determine the probability that are at least 2 men in the group whose serum cholesterol level is at most 230. Assume 90% of men's serum cholesterol level is less than c. What is the value of c?
If the association decides to comprise only the top 25% of the racers, what should be the cutoff time in the tryout run? Suppose the variable is normally distributed. Would a person who runs the cou
USA today reported that approximately 25% of all state prison inmates released upon parole become repeat offenders while on parole. Assume the parole board is determining 5 prisoners up for parole L
Develop a 90% confidence interval for the population mean,µ. Develop a 95% confidence interval for the population mean,µ .
Starting salaries of 145 college graduates who have taken the statistics course have a mean of $43,608 and a standard deviation of $8,347.
Employ the confidence level and sample data to determine a confidence interval for estimating the population (mean symbol). Test scores: n = 98, x(bar over x) = 81.9, (standard deviation symbol) = 7.8
Employ the given degree of confidence and sample data to construct a confidence interval for the population proportion p.
The average number of years served through those 35 justices was 13.8. If standard deviation of the whole population is 7.3 years, determine the 95% confidence interval for the average number of yea
Determine the minimum sample size you should employ to assure that your determine of p will be in the required margin of error around population p.
Employ the given degree of confidence as well as sample data to construct a confidence interval for the population proportion p.
A random sample of 70 printers discovered that 20 of them were being employed in small businesses. Determine the 99% limit for the population proportion of printers that are used in small businesses
A random sample of 100 voters found that 44% were going to vote for certain candidate. Find the 99% limit for the population proportion of voters who will vote for that candidate.
A study of elephants is conducted to find out the average weight of a certain subspecies of elephants. The standard deviation for the population is 500 pounds. At a 80% level, how many elephants nee
A researcher conducted a study of access speed of 35 hard drives and concluded that his maximum error of estimate was 35. If he were to conduct a second study to reduce the maximum error of estimat
If a population has the standard deviation of 18, determine the minimum number of samples that need to be averaged in order to be 95% confident that the average of the means is within 2 of the true
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. Which of the following is the
A student looked up number of years served by 35 of more than 100 Supreme Court justices. The average number of years served by those 35 justices was 13.8. If standard deviation of the entire popula
The claim is that proportion of drowning deaths of children attributable to beaches is more than 0.25, and the sample statistics include n = 615 drowning deaths of children with 30% of them attribut
Age at onset of dementia was stated for a sample of adults between ages of 60 and 75. For 15 subjects, the results were SX = 1008, and S(X-M)squared = 140.4. Use this info to answer the following:
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
A researcher randomly chooses six fathers who have adult sons as well as records the fathers' and sons' heights to obtain the data below. Find out if sons are taller than their fathers at the a = 0