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The life in hours of a 75-watt light bulb is known to be normally distributed with s=25 hours. A random sample of 20 bulbs has a mean life of x =1014 hours.
(a) Construct a 95% two-sided confidence interval on mean life.
(b) Construct a 95% lower-confidence bound on the mean life.
Develop a scatter diagram with price as the independent variable and what does the scatter diagram developed in part (a) indicate about the relationship between the two variables?
q1. suppose you estimate a model obtaining wage 0.620 0.506 times educ 2.27 times female were wage is measured in
Compute the pdf of continuous random variable Z where Z = X + Y and X is a continuous random variable uniformly distributed on [0, 2] and Y is a continuous random variable uniformly distributed on [0, 4]. Assume that X and Y are independent.
a what do we understand for measures of central tendency?b what are some examples of measures of central tendency?c is
Four are slow songs, and six are fast songs. Each song is to be played only once. In how many ways can the disc jockey play the 10 songs if. The songs can be played in any order.
(a) Find the mean and the standard deviation of X
an urn contains one black and n-1 white balls. calls are drawn at random until the black ball is selected. find the
Identify the null hypothesis, alternative hypothesis, test statistic, p-value or critical value, and the conclusion about the null hypothesis. Use the P-value method.
If there are repeated independent trials and there are only two outcomes, what distribution should be used?
If he calls on four potential clients, what is the probability that he makes exactly 3 sales? What is the probability that he makes exactly 4 sales?
Explain in detail and give an original example of the four types of probability.
Department decided to conduct the test at the 0.05 level of significance whether the modification actually increased the life of the AAA battery. What was their decision rule?
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