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The mean gross annual income of certified welders are normally distruted with the mean of 20,000 and a standard deviation of 2200. The ship building association wishes to find out whether this number is still accurate. you take a sample of 45 welders salaries and find the average to be 21500. using a significance level of .10, has there been a change in the mean gross annual income of certified welders?
a. State the null and alternate hypothesis
b. What is the level of significance?
c. What is the critical value?
d. Compute the value of the test statistic
e. What is your decision regarding the null hypothesis? Interpret the result.
What is the F critical value to be used at the 0.05 level of significance with 7 numerator degrees of freedom and 12 denominator degrees of freedom?
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question assume the branch manager requested estimates of the mean selling price of gulf view condominiums with a
Show the complete ANOVA table for this test including the test statistic. The null hypothesis is to be tested at 95% confidence. Determine the critical value for this test. What do you conclude?
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a vertical line is drawn through a normal distribution at z -1.00. the line separates the distribution into two
A. What is the standard deviation?
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Research at the University of Toledo indicates that 50 percent of the students change their major area of study after their first year in a program.
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