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Best Electronics, Inc. offers a "no hassle" returns policy. The number of items returned per day follows the normal distribution. The mean number of customer returns is 10.4 per day and the standard deviation is 2.3 per day.
(a) In what percent of the days are there 7.5 or fewer customers returning items? (Round z-score computation to 2 decimal places and your final answer to 2 decimal places.)
(b) In what percent of the days are between 11 and 12 customers returning items? (Round z-score computation to 2 decimal places and your final answer to 2 decimal places. )
(c) Is there any chance of a day with no returns?
In the history class the mean score was 76 with standard deviation 3.
The diameters of ball bearings are distributed normally. The mean diameter is 74 millimeters and the variance is 16. Find the probability that the diameter of a selected bearing is less than 78 millimeters.
Now assume institutional cache is used. Hit rate for cache is 0.6. Determine the total average response time.
Findout the probability using normal approximation for the provided values. Findout the specified probability from a table of Normal probabilities.
Findout the variance also standard deviation for the 2 distributions above. Evalute the variation of the data sets.
How many cans of paint should the sample contain if the researcher wants to be 98% certain of being within one percentage point of the true proportion of this chemical?
Make a histogram showing the probabilties of r = 0, 1, 2, 3, 4, 5, 6, 7 or 8 defective syringes in a random sample of 8 syringes.
Sketch the appropriate distribution, and locate the critical region for a = 0.05.
Harry and Melissa Jacobson produce handcrafted furniture in a workshop on their farm. They have obtained a load of 600 board feet of birch from a neighbour and are preparation to produce round kitchen tables and ladder-back chairs during the next ..
John conducted his study to measure self-esteem among victims of domestic violence before and after they complete an 8-week program for abuse victims with 10 individuals. He calculated t = 1.9 from his data.
Do the data from this sample provide evidence for a significant increase in REM activity during exams? Use a one-tailed test with _ = .01. B.) Compute Cohen's d to estimate the size of the effect.
Does this sample indicate a smaller average? Use α = 0.05 and assume a normally distributed population.
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