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First grade children have heights that are normally distributed about a mean of 37 inches and a standard deviation of 2 inches. A random sample of size 25 is taken and the mean is calculated. Find the probability that the mean value (X-bar) will be between 36.5 and 41.0 inches
A large construction firm estimates that 25% of the jobs that it manages are not completed within the contracted time period. It looks at a random sample of 8 jobs that it has managed. a. What is the probability that less than 3 of the jobs were ..
a) What statistical test should be used to analyze these data? b) Identify H0 and Ha for this study. c) Conduct the appropriate analysis d) Should H0 be rejected? What should the researcher conclude?
Household income does not tend to follow a normal distribution in a particular state, yet average income is approximately $45,000/year in this state, with a standard deviation of about $9000.
A plant manager used a 24 factorial design with two replicates for each treatment to study the effects of four process variables (XI, ... , X4 ) on product quality (Y). State the response model in the form of (29.2a).
Find the value of range of frequency distribution Age.- in years : 14,15,16,17,18,19,20- No.of.students: 1,2,2,2,6,4
Solve x^2 = -2 where x is a real number. Simplify your answer as much as possible.
A. One can be 95% confident that the interval 17.9months to 49.5months contains the mean duration of imprisonment,muμ,of the prisoners. B. One can be 95% confident that the minimum error made in estimating muμby x overbarxis as found in part(a). C...
the proportion of public accountants who have changed companies within the last three years is to be estimated within 4
Find the probability of winning jackpot?
A study reports an analysis of 35 key product categories. At the time of the study, 72.9% of the products sold were of a national brand, 23% were private label.
The X variable is time and the Y variable is examination grade. Calculate r. Use Table A to determine if it is statistically significant.
an index of two store items for 2007 based on 2004 is to be constructed. the information for the prices and quantities
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