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What does bivariate normal distribution mean? Explain in words or illustrate with a figure.
What is the coefficient of determination? If an r=0.8, what is the coefficient of determination?
In 1988 the mean expenses for college were $8000 with a standard deviation of $800. If 40 students were selected at random, what is the probability that the mean expenditure for this sample would be
The amount of time (in minutes) devuted to commercials on a TV channel during any half-hour program is a random variable whose mean is 6.6 minutes and whose standard deviation is .866 minutes. If 40
The weight of food packed in certain containers is a random variable with a mean of 16 oz. and a standard deviation of .6 oz. If 36 packages are randomly selected, find the probability that the mean
The standard deviation of a normal random variable is 20. If a sample of 225 is selected out of a large population, what is the standard error of the mean? Round to 3 decimal places.
You sample 254 students. What is the standard deviation of sampling distribution of their average score?
Scores on the Critical Reading Part of the SAT exam in a recent year were roughly Normal with mean 501 and standard deviation 112. you choose an SRS of 100 Students and average their SAT crigical re
For a sample of 45 shipment lots, what is the probability that the sample mean for the number of wire cables with tensile strengths below the lower specification limit exceeds 53?
Dole Pineapple Inc. is concerned that the 16 ounce can of sliced pineapple is being overfilled. The quality control department took a random sample of 50 cans and found that the arithmetic mean was
The body mass index (BMI) of an individual is one measure that is used to judge whether an individual is overweight or not. A BMI between 20 and 25 indicates that one is at a normal weight. In a sur
Beta Industries has net income of $1,700,000, and it has 1,830,000 shares of common stock outstanding. The company's stock currently trades at $61 a share.
Calculate by hands. Report the Chi-square statistic, degrees of freedom, critical value, and your decision. Conduct the data analysis via SPSS. Write the results using APA style. (I just need to know
Using a binomial table, find the binomial probabilities p(x) associated with given n, ratio, and x. a. n=6, ratio = 0.10, p(4) b. n=10, ratio =0.7, p(7) c. n=20, ratio = 0.4, p(3) d. n=8, ratio =0.9
According to most estimates, 10% of the people in the general population are left-handed and 90% are right-handed. A neurological theory of handedness and cerebral dominance predicts that there shou
Studies find that in a random sample of 3000 adults aged 18 and over, 1410 owned an MP3 player. The 95% large-sample confidence interval for the proportion of all adults aged 18 and over who own an
Please write down the simple linear regression model relating games won to yards gained rushing by opponents. Please interpret the intercept and the slope.
Plot the great-circle route from Washington, D.C. (39 degree N, 77 degree W) to Moscow (56 degree N, 38 degree E). What is the distance between the two cities?
Let X = the time between two successive arrivals at the drive-up window of a local bank. If X has an exponential distribution with ? = 1, (which is identical to a standard gamma distribution with ?
The Rockwell hardness of a metal is determined by impressing a hardened point into the surface of the metal and then measuring the depth of penetration of the point. Suppose the Rockwell hardness of
Suppose IQ scores were obtained from randomly selected couples. For 20 such pairs of people, the linear correlation coefficient is 0.896 and the equation of the regression line is y^=6.22 + 0.95x, w
The blood pressure measurements of a single patient were taken by twelve different medical student and the results are listed below. Construct a scatterplot, find a linear correlation coefficient r,
If alpha=0.05 and p= 0.07 ,would we reject or fail to reject null hypothesis? Please explain.