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Consider a regression situation in which y = hardness of molded plastic and x = amount of time elapsed since termination of the molding process. Summary quantities included the following.
n = 14, SSResid = 1233.45, and SSTo = 25,321.368.
(a) Calculate a point estimate of ?. (Give the answer to three decimal places.)
On how many degrees of freedom is the estimate based?
(b) What proportion of observed variation in hardness can be explained by the simple linear regression model relationship between hardness and elapsed time? (Give the answer to three decimal places.)
three students scheduled interviews for summer employment at the brook wood institute .in each case the interview
The binomial distribution approaches normality as N increases. Explain how this relationship is useful for solving binomial problems involving N > 20. What are the advantages and disadvantages of this approach?
As it is a 2 _ 2 table, try also two-tailed two-sample z test for ð1 = ð2 and verify that z2 is same as your chi-square statistic. Which test do you favour? Describe why?
Suppose that the average number of years to graduate at a university is 4 years, with a standard deviation of 0.5 years. From the Empirical Rule, what is a range of values that 95% of the students should graduate between?
Using symbols mention null hypothesis and alternative hypothesis.
assuming that the population is normally distributed construct a 95 confidence interval for the population mean based
In the regression analysis involving 25 observations following estimated regresion equation was developed. hat(Y) = 10 - 18x1+3x2+14x3 also follwoing standard errors. Test stastic for testing significance of model is?
What happens to the confidence interval if you (a) increase the confidence level, (b) increase the sample size, or (c) increase the margin of error?
question 1 the average teachers salary in arizona is 42300 with standard deviation 5000. assuming a normal distribution
Find the probability of committing a type I error.
Suppose the population standard deviation is 0.3 minutes and the sample mean is 9.975. A 90-percent confidence interval for the true mean delivery time is?
Area to right of mean of normal probability distribution is?
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