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A new light bulb is being considered for use in an office with computers. It is decided that the new bulb will only be used if it has a mean lifetime of more than 500 hours. A random sample of 40 bulbs is selected and placed on life test. The mean and standard deviation are found to be 505 hours and 18 hours, respectively. Perform the appropriate test of hypothesis to determine whether the new bulb should be used. Use a 0.01 level of significance.
A. 0 tailedB. 2 tailedC. 1 tailed leftD. 1 tailed righ
question based on comparing the computed chi square with the critical value for chi square which if the following is
Different approaches for creating systems simulation models include?
Use the given information to estimate the probability that a newborn baby is male, given that the ultrasound predicted the baby would be male.
the lengths in minutes of a random selection of popular childrens animated films are listed below. estimate the true
How many business majors would be required to evaluate mean salary to within 10 with 95% confidence if population standard deviation is %200.
a new no-frills airline runs a commuter shuttle service using a refurbished world war ii bomber. the two-propeller
The mean of land and buildings per acre from a sample of farms was $637, with a standard deviation of 26. Use Empirical Rule to find approximate percentage of acreage whose values were between $ 661 and $663.
a manager of a large corporation recommends a 10000 raise be given to keep a valued subordinate from moving to another
a stationery store wants to estimate the mean retail value of greeting cards that it has in its inventory. a random
Determine point estimate of population mean? By using 90% confidence, determine the margin of error?
What is your decision about H0 and H1 at = 0:05? Give the orderings of the population means according to the tukey procedure. Is H0 : 2 = 4 a contrast?
suppose a school has 20 classes 16 with 25 students in each three with 100 students in each and one with 300 students
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