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a) The average lifetime of a certain new cell phone is 3 years. The manufacturer will replace any cell phone failing within 2 years of the date of purchase. The lifetime of these cell phones is known to follow an exponential distribution.
What is the decay rate? (Enter your answer as a fraction.)
b)The Sky Train from the terminal to the rental car and long-term parking center is supposed to arrive every 16 minutes. The waiting times for the train are known to follow a uniform distribution.
Find the 70th percentile for the waiting times (in minutes).
According to Gallup s annual poll on personal finances, while most U.S. workers reported living comfortably now, many expected a downturn in their lifestyle.
Personal probability. Personal probabilities are personal, so we expect them to vary from person to person. Choose an event that most students at your school.
Suppose that in a network of 3 computers, at a given time the event that the kth computer is down has overall probability pk, k = 1, 2, 3,
Use the t-distribution table to find the critical values for the indicated alternative hypothesis, level of significance, a and sample size n1 and n2. Assume that the sample are independent, normal and random. Ha: u1
On the following terms could you please give my an English text description - in your own words. 1. Algorithm:
A company s records indicate that on any given day about 1% of their day-shift employees and 2% of the night-shift employees will miss work- Is absenteeism independent of shift worked? Explain.
Suppose 6 people are in a room. What's the probability that two of them have the same birthday?
What methods of statistics can be used with the sample data for inferences about the general population? Explain.
A school accepts the top 10% of the applicants based on the entrance exam. The scores are normally distributed with a mean of 88 and a standard deviation of 3. What is the cutoff score to be admitted to the school?
With a beta of 1.9 and expected rate of return of 28%. If the market return this year turns out to be 12 percentage points under expectations
Let rp be the Pearson product moment correlation coefficient defined in (8.78). Show that rs (8.63) is simply this Pearson product moment correlation coefficient applied to the rank vectors (R1, ... , Rn ) and (S1, ... , Sn ) instead of the original ..
a group of researchers studied the effect of global environmental change on grazing lands. their article reported the
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