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It has been observed that electrical connectors that are manufactured by Jolt Electrical Supply Company last an average of 18.2 months and follow a normal distribution with a standard deviation of 1.7 months. Jolt agrees to replace any connector that fails within 19 months. Out of 500 connectors...
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1. Define a parameter. (Points: 5) A parameter is quantitative measurement. A parameter is a numerical measurement describing an aspect from a population. A parameter is a numerical measurement describing an aspect from a sample. A parameter is qualitative...
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differences between a one-tailed and a two-tailed test
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The probability mass function (p(x)=P(X=x)) for X= number of cars owned by a randomly selected family in a given town is x= 0 1 2 3 4 f(x)= 1 .08 .15 .45 .05 a. Find and graph the cumulative distribution function (F(x)= P(X less than or equal to x)) for X....
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If the mean SAT score is 1518 and the standard deviation is 325 what scores correspond to P20 and P65? (the 20th and 65th percentiles)
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daily sales at a hardware store are normally distributed with a mean of $3500 and a standard deviation of 240.a) A random sample of 16 days sales is selected and the mean is recorded as $3320, should this be of concern to management? why or why not? b)If 62% of daily sales are greater than x,...
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A producer of various kinds off batteries has been producing D size batteries with a life expectancy of 87 hours. Due to an improved production process, management believes that there has been an increase in battery life expectancy. A sample of 36 batteries showed an average life of 88.5...
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Find the percentage of area under a normal curve between the mean and the given number of standard deviations from the mean. This problem can be solved using technology or the table for the standard normal curve from your text.
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can u do this for me ?? if you could i will upgrade my membership on this website....
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A fitness company is building a 20-story high-rise. Architects building the high-rise know that women working for the company have weights that are normally distributed with a mean of 143 lb and a standard deviation of 29 lb, and men working for the company have weights that are normally...
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- 1. A school administrator wonders if students whose first language is not English score differently on the math portion of the sat exam than students whose first language is English. The mean SAT math score of students whose first language is english is 516 on the basis of data obtained from the college board. A simple random sample of 20 students whose first language is not English result in a sample mean SAT math score of 522. SAT math score are normally distributed with a population standard deviation of 114. Why is it necessary for SAT math scores to be normally distributed to test the hypothesis?
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