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An experimenter compares two sets of measurements from indpendent samples:
GPA of SCSU students is normally distributed with standard deviation 0.8. The average GPA of a random sample of 25 students found to be 2.3. Find the 98% confidence interval for the mean GPA of all
Construct a histogram and a percentage polygon. Construct a cumalitve percentage distribution and plot a cumalative percentage polygon (ogive).
Suppose 250 people out a survey asking how many dogs and cats they own. The results are given in the following table, where the entry in row i and column j is the number of respon
A researcher records the level of attention among 18 students during an interactive and lecture portion of a single class. If she computes a related samples t-test at a .05 level of significance (tw
A random sample of size 100 is to be taken from a population that has a proportion equal to 0.35. The sample proportion will be used to estimate the population proportion.
A researcher uses analysis of variance to test for mean differences among four treatments with a sample of n = 8 in each treatment. The F-ratio for this analysis would have what df values?
A common test for extrasensory perception (ESP) asks subjects to identify which of four shapes (star, circle, wave, or square) appears on a card unseen by the subject.
Let P(x, y) be the probability of choosing an x-colored ball on the first draw and a y-colored ball on the second draw. Compute the probability for each outcome of the experiment.
Find the mean and the standard deviation for the population. Samples sizes of 2 will be drawn from the population. Use the answers in part a to calculate the expected value and the standard deviation
Consider the following. (Give your answers correct to two decimal places.) Find the standard score (z) such that the area above the mean and below z under the normal curve is 0.3814.
The weights of ripe watermelons grown at Mr. Smith's farm are normally distributed with a standard deviation of 2.1 lb. Find the mean weight of Mr. Smith's ripe watermelons if only 9% weigh less th
Suppose we have a weightd coin, which comes up heads with probability p. We toss the coin until we obtain a total of n heads (for some integer n>0). What is the expected number of tosses until th
Would you suspect that the IDEA surveys sent to South students each term could be biased in the responses receieved? Why or why not? Using the data set below please calcutate the : 1, 16, 12, 1, 2,
Suppose IQ score were obtained from a randomly selected siblings.For such 20 pairs of people the linear corelation is 0.907 and the equation of regression line is y= 3.92+0.95x ,where x represents t
The heat evolved in calories per gram of a cement mixture is approximately normally distributed. The population mean is thought to be 100 and the population standard deviation is 2. Data on n=9 spec
The 70-year long-term record for weather shows that for New York State, the annual precipitation has a mean of 39.99 inches and a standard deviation of 4.39 inches. The annual precipitation amount h
Black bears (Ursus americanus) have a tendency to wander for food, and they have a high level of curiosity. These characteristics will sometimes get them into trouble when they travel through human-
What proportion of Americans drink more than the recommended 8 servings? What proportion of Americans drink less than half the recommended 8 servings?
According to the M&M company, each package of Plain M&Ms should contain 24% blue, 14% brown, 16% green, 20% orange, 13% red, and 14% yellow M&M's. Explain in detail the difference betwee
The weights of all candy bars of this type are certainly not constant because of slight variations in the factory production process. Assume these weights vary according to a normal distribution wit
Remains constant if the value of sigma is known What is the sampling distribution of a statistic? Explain in your own words.
To give a 99.9% confidence interval for a population mean ?, you would use the critical value