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A manufacturer uses a new production method to produce steel rods. A random sample of 17 steel rods resulted in lengths with a standard deviation of 21.1cm. At the 0.10 significance level , test the claim that the new production method has lengths with a SD different form 3.5cm which was the SD for the old method. Identify the null hypothesis, alternative hyp9otheses, test statistic or P-value and the final conclusion that addresses the original claim.
A researcher uses hypothesis test to estimate H0 µ= 80. Which combination of factors is most probable to result in rejecting null hypothesis?
For these 4 questions below what would be the independent and dependent variables, the level of measurement and whether or not the variable is discrete or continuous.
Suppose that 15% of all adults jog. An opinion poll asks a simple random sample of 500 adults if they jog. What is the sampling proportion in the sample who jog?
Suppose the population standard deviations are not the same. At.05 significance level, is there a difference in mean waiting time?
In both cases, give a number of data points, n, and a correlation coefficient, r. Draw a number of data points, n, and a correlation coefficient, r. Tell whether the correlation is significant at 0.05 or 0.01 level, explain.
What is Bayesian sample size determination for ANOVA and regression with formula?
In ANOVA, which of the following is not affected by whether or not the population means are equal?
For every additional hour spent studying for the exam you would expect a grade improvement of 60.2 points
A Correlation matrix (correlation, coefficients and probability level under the hypothesis rho= 0) for a company's sales force (age, years of service, and current sales) is given below. Comment.
Based on the information, what decision should the director make about the books used for the courses if the goal is to keep the cost below $300?
Determine the probability that Mexican American male in the 20 -74 age range has serum cholesterol value greater than 240 mg/dl.
Is the normal distribution (or its special case, the standard normal distribution) effective in characterizing situations and/or in helping managers make decisions?
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