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If a random sample of 100 math students are taken and 30 of the students are male, what would the confidence interval be if a 80% confidence level is desired?
You have been asked for assistance regarding the type of survey(s) that should be used in five research situations. Recommend whether a personal interview, telephone interview, self-administered qu
You have been asked for assistance regarding the type of survey(s) that should be used in five research situations. Recommend whether a personal interview, telephone interview, self-administered que
A parcel service randomly selected 48 packages it received. The sample has a mean weight of 18.6 pounds. Assume that σ=3.2 pounds. Construct a 95% confidence interval for the true mean, μ,
The following statistics were found using the 23 gas prices submitted for the project. What is the point estimate of the population standard deviation?
The Republican party suspects there are geographical differences regarding five issues. The importance of each issue is based on ratings (1=low to 5=high) gotten from telephone interviews of 100 pe
If the two variables were interest rates and mortgage re-financings, would you expect the correlation coefficient (r) to be positive or negative? State your reasons.
Which of the following will increase the value of the power in a statistical test of hypotheses?
Is there sufficient evidence to conclude that the variance in carbohydrate content varies between chocolate and non chocolate candy? Use a=0.10.
The upper and lower levels of the GPA that include 2/3 of all grades (assume the upper and lower levels are equidistant above and below the mean)
Define population and sampling unit for selecting a random sample in each of the following cases.
Determine the probability of a normally distributed data point being in the ranges indicated in the following two cases
A sample of n = 4 difference scores produces SS = 48. What is the estimated standard error for the sample mean difference?
To test the claim, a researcher selects a sample of 30 hotel rooms and finds that the average cost is $68.43. The standard deviation of the population is $3.72. At ?=0.05, is there enough evidence
In the following table, indicate the type of scale (nominal, ordinal, interval, ratio), measure(s) of central tendency (mean, median, mode) and dispersion (range, percentiles, standard deviation) a
Grades for ten students are: 88, 93, 83, 97, 73, 88, 85, 59, 73 and 79. Determine the following: Measures of dispersion: range, top 20th percentile, and standard deviation
A pair of dice is rolled 10 times. What is the probability that a sum of seven is observed at most three times?
Grades for ten students are: 88, 93, 83, 97, 73, 88, 85, 59, 73 and 79. Determine the following: a. Measures of central tendency: mean, median, and mode
The following sample was obtained from a population with unknown parameters. Compute the sample mean and standard deviation.
Is it possible, by adding redundant components to raise the reliability of the system to at least 0.95? If so explain how.
Draw a tree diagram that indicates the possible production routes for a unit of the product. How many production routes are possible?
Using α > = 0.05, a confidence interval for a population proportion is determined to be 0.15 to 0.35. If the level of significance is increased, the interval for the population pro
Suppose that a standardized test has a mean of 250 and standard recitation of 80. If the test is normaaly distributed what proportion of the exam have a score higher than 270?
Suppose 15% of the trees in a forest have severe leaf damage from air pollution. If 5 trees are selected at random, find the probability that Three of the selected trees have severe leaf damage.