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A researcher was interested in determining the effect of an experimental drug on the lifespan of laboratory rats. Shown below is a summary of lifespans, in months, for laboratory animals administ
Why does analysis of variance should be conducted only when population variances can be assumed to be equal? why not when they are approximately equal? Is it because there is no way of knowing the
A sample of 250 observations is selected from a normal population for which the population standard deviation is known to be 24. The sample mean is 20.
The power generated by a solar electric generator is normally distributed with mean 15.6 kilowatts and standard deviation of 4.1 kilowatts. We may be 95% sure that the generator will deliver at leas
The time interval between two successive customers entering a store in a mall is exponentially distributed with a mean of 6.55 seconds. What is the probability that the time interval is more than 10
When running a non-parametric test on SPSS with a small sample size, which test statistic will NOT provide the most accurate result?
A simple random sample of 40 items resulted in a sample mean of 25. The population standard deviation is 5. What is the standard error of the mean (to 2 decimals)?
Using a table of critical t-values of the t distribution, find the range of values for the P-value for testing a claim about the mean body temperature of healthy adults for a left-tailed test with n
The results of a Newsweek poll concerning views on abortion showed that of n = 1002 adults, 39% favored the right-to-life stand while 53% were pro-choice. The poll reported a margin of error of plus
State University uses thousands of fluorescent light bulbs each year. The brand of bulb it currently uses has a mean life of 760 hours. A competitor claims that its bulbs, which cost the same as the
However, the Creel Survey reported that of a random sample of 51 fish caught, the mean length was x-bar = 18.5 inches, with estimated standard deviation s = 3.2 inches. Do these data indicate that t
Acid rain, caused by the reaction of certain air pollutants with rainwater, appears to be a growing problem in the northeastern United States. Acid rain affects the soil and causes corrosion on expo
A large university is interested in learning about the average time it takes students to drive to campus. The university sampled 238 students and asked each to provide the amount of time they spent
Test the claim that the population of earthquakes has a mean magnitude greater than 1.00. Use a 0.01 significance level, Identify the test statistic and P-value. Assume this is a simple random sampl
Suppose that certain tool bits are package 20 to a box, and the following sampling plan is used. A Sample of three tool bits is draw, and the corresponding box is accepted if and only if both bits
Listed below are brain volumes in cm cubed of unrelated subjects used in a study. Use a 0.01 significance level to test the claim that the population of brain volumes has a mean equal to 1099.5 cm c
How many tissues should a package of tissues contain? Researchers have determined that a person uses an average of 41 tissues during a cold. Suppose a random sample of 10,000 people yielded the foll
The goal was to determine if the average travel time of all the university's students differed from 20 minutes. Suppose the large-sample test statistic was calculated to be z = 2.14. Find the p-valu
Let x be a random variable that represents the amount of a randomly selected monthly cell phone bill. We know that x has a normal distribution with a mean of µ = $63.50 and a standard deviatio
Use technology to find the P-value for a right nailed test with n=12 and t=1.318. How do you find this answer on a TI-84 calculator?
For the given binomial sample size and null-hypothesized value of p0, determine whether the sample size is large enough to use the normal approximation methodology to conduct a test of the null hypo
For many countries tourism is an important source of revenue. Data are collected on the number of foreign visitors to a country (in millions) and total tourism revenue (in billions of dollars) for a
Construct a 99% confidence interval for the population mean mu. ( , ) (Round to two decimal places as needed.)
A random variable X takes values between 0 and 4 with cumulative distribution function: F(x) = x2/16 for 0 ? x ? 4. What is the median of X?
The genes for eye color in a certain male fruit y are (R, W). The genes for eye color in the mating female fruit y are (R, W). Their offspring receive one gene for eye color from each parent. If an