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Given the R2 value, do you believe that higher expenditure on exported goods leads to higher personal income? Explain your reasoning.
The average cost for new tires on a vehicle is $157.00. Assuming a normal distribution, if 70 percent of the costs for tires is less than $171.00, what is the standard deviation? The answer is $25.
Durable press" cotton fabrics are treated to improve their recovery from wrinkles after washing. Unfortunately, the treatment also reduces the strength of the fabric.
The probability that the patient enters a law suit is 0.9. What is the probability that the doctor makes an incorrect diagnosis and the patient sues.
The pediatrics unit of a local hospital has 24 beds. The number of patients needing a bed at any proint in time is normally distributed with a mean of 19.2 and standard deviation of 2.5. The probab
Assume the weight of a randomly chosen American passenger car is uniformly distributed random variable ranging from 2,500 pounds to 4,500 pounds. What is the standard deviation of the weight of a ra
The amount in each can and find the average, the probability that the average of the six cans will be between 11.9 and 12.1 oz equals which standard normal probability?
A couple planning their wedding must decide on the menu for the reception. There are ten appetizer packages, seven main courses, and three dessert packages to choose from. In how many different ways
You are one space short of winning a child's board game and must roll a 1 dice to claim victory. Calculate the actual probability model.
A researcher is testing the effectiveness of a new herbal supplement that claims to imrpvoe memory performance. a sample of n=25 college students is obtained an each student takes the supplement dai
The mean value of land and buildings per acre from a sample of farms is $1200, with a standard deviation of $350. Assume the data set has a bell-shaped distribution. Between what two values do abou
The population mean weight of newborn infants is reported as 6.6 pounds, but a new intern at a local community hospital wants to check this claim. a sample of seven infants is randomly selected and
Multiply these (one at time) with 200 to get the expected frequencies. Apply the chi-square formula and then obtain the tabulated chi square and make your conclusion.
A college accepted 512 of the 1,600 applicants one year, and 520 of the 1,300 applicants the next year. Can we conclude that the admissions rate was higher the second year than the first year? Dete
A machine is set to pump cleanser into a process at the rate of 8 gallons per minute. Upon inspection, it is learned that the machine actually pumps cleanser at a rate described by the uniform distr
Again multiply 200 by the expected proportions given in the problem(i.e. 14%, 26%,... etc) to get the expected frequencies. Then use the formula to compute chi square.
Then multiply by 50 to get the expected frequencies. Use the formula to calculate Chi-square. Compare with the tabulated value.
A researcher computes the mean, the median, and the mode for a set of n = 50 responses to this question. Which of the following statements accurately describes the measures of central tendency?
Suppose that the protion of all invoices that were paid late is 20 percent. In a random sample of 140 invoices, determine the probability that more than 28 percent invoices were paid late.
The total number of participants 180. Obtain the expected frequencies using this number and the observed frequencies given in the problem for females and males.
The average amount of time people spend on facebook each day is 64 minutes, with a standard deviation of 4.5 minutes. Are you more likely to select a random person that spends less than 62 minutes
If the actual average game time (μ), for the 190 games, was 3.2 hours and the standard deviation (sigma) was one hour (1.0); calculate the probability that a randomly chosen sample of 17 games w
Use the formulas to obtain the slope b and intercept a for part a. Then just follow the simple instructions in parts b - c. For part a you should get estimated regression line as Y hat = 3X - 3.
Use the sales forecaster's prediction to describe a normal probability distribution that can be used to approximate the demand distribution. Sketch the distribution and show its mean and standard de
Calculate the Pearson correlation for the scores. Find the regression equation for predicting Y from the X values. Use: Sp/SSx to obtain the slope b. Then use a = My - b*Mx.