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In a large fleet of delivery trucks the average number inoperative on any day because of repairs is 2. Two standby trucks are available. What is the probability that on any day (i) no standby trucks will be needed, (ii) the number of standby trucks is inadequate.
Repeat the calculations in part b for samples of size 5 and 2. What effect does a change in the sample size appear to have on the dispersion of the sampling errors?
Suppose that the proportion X of defective items in a large lot is unknown, and that X has a beta distribution with parameters ex and fl.
for a particular age group of adult males the distribution of cholesterol readings in mgdl is normally distributed with
Construct a first- order autoregressive forecasting equation for these data, calculate the mean absolute deviation (MAD) for the fit of the forecast values to the actual values, then use the equa- tion to forecast the PPI for 2008. Source: Bureau o..
an srs of 18 recent birth records at the local hospital was selected. in the sample the average birth weight was 119.6
if we are testing the difference between the means of two normally distributed populations with samples of n1 10 n2
Find two values of the standard normal random variable, z and -z, such that the two corresponding tail areas of the distribution.
Units 1 and 2 form a parallel subsytem in series with unit 3 and a three of five combination of units 4 through 8.
Suppose that the mean value of interpupillary distance (the distance between the pupils of the left and right eyes) for adult males is 65 mm and that the population standard deviation is 5 mm.
The data below gives the number of friends for a simple random sample of Facebook users. Use a 95% confidence interval to estimate the mean number of Facebook.
A teacher wants to examine the impact of caffeine on test performance. She randomly assigns 60 students in her class to three groups (no caffeine-placebo
Calculate a table of expected counts for the data in given Exercise.- Show calculations verifying that the value of the chisquare statistic is 17.78.
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