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A manufacturer claims that the mean lifetime of its light bulbs is 55 months. The standard deviation of these lifetimes is 6 months. Twenty-two bulbs are selected at random, and their mean lifetime is found to be 56 months. Assume that the population is normally distributed. Can we conclude, at the 0.05 level of significance, that the mean lifetime of light bulbs made by this manufacturer differs from 55 months?
Perform a two-tailed test. Then fill in the table below.
Carry your intermediate computations to at least three decimal places, and round your responses as specified in the table. (If necessary, consult a list of formulas.)Please answer:Ho=H1=Type of test?The values of the test statistic?The two critical values at the 0.05 level of significance?Can we conclude that the mean lifetime of light bulbs made here differs from 55 months?
Most individuals are aware of the fact that the average annual repair cost for an automobile depends on the age of the automobile. A researcher is interested in finding out whether the variance of the annual repair costs also increases with the ag..
What is the difference between the Wilcoxon signed-ranks test and the Wilcoxon rank-sum test? no minimum word count.
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Assume that waiting times are approximately normally distributed. Construct a 98% confidence interval for the population mean of waiting times.
A researcher used stepwise regression to create regression models to predict Birth-Rate (births per1000) using five predictors:
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Programmers have monthly incomes of less than $2,834, what is the value of the standard deviation of the monthly earnings of the computer programmers?
Now consider the real numbers. In fact, lets narrow our focus way down to just the part of the real line between 0 and 1. Circle that part of the real line. How many real numbers are there in between 0 and 1? What can you conclude from all this?
The mean number of tasks completed successfully by all teams each day and the standard deviation is computed. The results are given below. The ANOVA F-test statistic value is?
The shell thicknesses of the eggs produced by a large flock of hens follow approximately a normal distribution with mean equal to 0.38 mm and standard deviation equal to 0.03 mm. Find the 95th percentile of the thickness distribution.
Record the type of research design used. True lab experiment, quasi-experiment, field experiment, or correlation design.
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