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Use linear regression to forecast values for periods 11 to 13 for the following time series.
Period
1
2
3
4
5
6
7
8
9
10
Observation
121
133
142
150
159
167
185
187
192
208
She wants to be 90% confident and be accurate within 5% of the true proportion. Find out the minimum sample size necessary.
Based on past information, for the cars used, the distance traveled by a car in a day averages 170 km with a standard deviation of 40 km. What proportion of cars used in any day travel less than 100 km?
Suppose your data is approximately normally distributed with a mean 25 and standard deviation 15. What is the approximate 97.5th percentile of your data?
Bottling Company Case Study
A person reads a research study of the effectiveness of perineal exercises in preventing urinary incontinence and notes that the number of subjects in each group is 120.
a) What is the probability of getting four hits in a particular game? (Round your answer to 3 decimal places.) b)What is the probability of not getting any hits in a game?
Simulate a completely random process of length 48 with independent, t-distributed values each with 5 degrees of freedom. Construct the time series plot. Does it look "random" and nonnormal? Repeat this exercise several times with a new simulation ..
What is the probability that the mean starting salary is between $31,000 and $33,000 - Graduates from a graphic arts course at a community college have a mean starting salary
Mean 504 and standard deviation 111. A sample of size 1000 is obtained from this population. What is the mean of the sampling distribution of the sample mean?
How does a t test differ from a z test in terms of when it is used, how it is calculated, and how we determine significance?
The accounting department at Weston reports that it takes two construction workers a mean of 32 hours and a standard deviation of 2 hours... Determine the z values for 29 and 34 hrs. What percent of garages take between 32 and 34 hrs to erect.
One of these has a history of selling an average of 200 items, with a standard deviation of 20. If he wants to maximize his profits, how many should he order?
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