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Question: The Screw Right Company claims their 3 / 4 inch screws are within ±0.23 of the claimed mean diameter of 0.750 inches with a standard deviation of 0.115 inches. The following data were recorded
The screws were randomly selected from the local home repair store.
a. Find the mean diameter and standard deviation for the sample
b. Find the probability that 50 randomly selected screws will be within the stated tolerance levels. Is the company's diameter claim plausible?
Assume grades in college accounting class are normally distributed with a mean of 82 and a standard deviation of 7. what is the probability that a randomly selected student from this class will have a grade lower than 65?
Find out the probability that a student from the whole school system, chosen at random, has passed?
Of the top 20 global brands, 24 of them (70 percent) are from United States-based corporations. What effects might this weighing have on the global consumer?
João is 24 years old. What would we predict for the number of hours he studies per week?- Kimberly is 19 years old. What would we predict for the number of hours she studies per week?
the true mean breaking strength of yarn used in manufacturing drapery material is required to be above 100 psi. from
Use mathematical induction to prove that : 1*2+2*3+3*4+....+n(n+1)(n+2)/3 for all n >_1 and (2) Find d=gcd (721 , 448), find integers s and t with d=721s + 448t, and put the fraction 448/721 in lowest terms.
A dataset has 1000 records and 50 variables with 5% of the values missing, spread randomly throughout the records and variables. An analysis decides to remove records that have missing values. About how many records would you expect would be remov..
Assume you are using ANOVA to study some phenomenon. There are three treatment levels and a total of 17 people in the study. Complete the following ANOVA table.
the mean weight of loads of rock is 49.0 tons with a standard deviation of 12.0 tons. if 9 loads are chosen at random
Examination of individual measurements shows that they are close to Normal. If the process mean is set to the target value, about what percent of films will meet the specifications?
suppose you were given the task of estimating the proportion of drivers in troy al who text while they drive. discuss
What proportion of sample means would be between 1.31 and 1.33 inches?
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