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In the following situation, suppose random variable is normally distributed and use normal distribution or a t-distribution to create 90% confidence interval for population mean. If convenient, use technology to create the confidence interval.
(a) In the random sample of 10 adults from nearby county, mean waste generated per person per day was 4.35 pounds and standard deviation was 1.88 pounds.
(b) Repeat part (a), suppose same statistics came from a sample size of 500. Distinguish the results.
(a) For sample of 10 adults, the 90% confidence interval is ( ), ( ).
(b) Now suppose the sample came from sample size of 500. Distinguish the results.
It is believed that population standard deviation is 15 days. If test is conducted using a 0.05 level of significance, what conclusion must be reached?
Determine the average amount of time that a guest spends checking in. How would this change under each of the state options?
Discuss whether this variable should be placed in the model as an ordinary quantitative variable or by means of four 0, 1 indicator variables.
Test the null hypothesis that a population mean is 50 against the alternate hypothesis that the mean is not 50. What "model" should be used and why?
Research question : At α = . 05, is cockpit noise level independent of flight phase?
Computing the probability values using normal distribution - Evaluate the percentage of homes that generate between 27 and 31 pounds of recycling per month.
A baseball player gets a hit in 30 out of 100 times at bat. What is the probability that he gets a hit in his next at bat?
In a sample of 55 mice, a biologist found that 42% were able to run a maze in 30 second or less. Find the 90% limit for the population proportion of mice who can run a maze in 30 second or less.
A furniture store claims that a specially ordered product will take, on average, M = 35 days (5 weeks) to arrive. The standard deviation of these waiting times is 8 days.
How variable is the number of service calls with which Sam's department must deal?
The area under the standard normal curve between 0 and 2 is twice the area under area between 0 and 1.
Explain the difference between one-factor and two-factor ANOVA. (b) Write the linear model form of one-factor ANOVA. (c) State the hypotheses for a one-factor ANOVA in two different ways.
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