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Suppose a bill is considered late if it is paid after 20 days.
In this case its "lateness" is the number of days over 20. For example, a bill paid 23 days after billing has a lateness of 3, whereas a bill paid 18 days after billing has a lateness of 0.
•Find a 95% confidence interval for the mean amount of lateness for all customers.
•Find similar confidence intervals for each customer size separately.
•Why is the distribution of lateness certainly not normal? Do you think this matters for the validity of the confidence interval?
It has been hypothesised that the probability of having an asthma attack on a particular day may vary across the days of the week. Baibergenov et al. (2005) report a longitudinal study in which the number of emergency department admissions due to ..
If 200 of the adults surveyed were in the age category of 24 and under and they provided a standard deviation of $14.50, construct a 95% confidence interval for the weekly average expenditure on fast food for adults 24 years of age and under.
British airways employs you as cunsultant to analyse the departure time of flight leaving Cape Town International Airport. The acceptance time frame for departures is 0 for on-time plus or minus 15 minutes. During a typical week the following flights..
An event independently occurs on each day with probability p. Let N(n) denote the total number of events that occur on the ?rst n days, and let Tr denote the day on which the rth event occurs. (a) What is the distribution of N(n)?
Brooke can expect a different grade in each of thecourses, depending on who teaches it next quarter. Determine the best course to take next quarter, using the following criteria Maximax.
question 1suppose that we have ratings of a restaurant from a sample of 72 customers. each of the ratings is either
Using the results, describe the effect of an outlier or extreme value on the confidence interval.
which of the following describes the effect of increasing sample size?measures of effect size and the likelihood of
the mean and the standard deviation of the sample of 100 bank customer waiting times in table 1.8 are xbar5.49 and
Use differential calculus to find both sales volume at which revenue is maximised and the maximum revenue available from sales of product X.
use the following information to compute the answers. show your work.8 9 9 9 10 10 10 11 11 16 17 17 17 19 20 21 21 21
Assuming that the process is operating correctly according to specifications, what is the probability that a sample will indicate that an adjustment is needed?
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