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A Police Officer believed that the average speed of cars travelling over a certain stretch of highway exceeds the posted limit of 60km/h. The speeds of a random sample of 20 cars were recorded. The average speed was found to be 61km/h with a standard deviation of 5km/h. Is there sufficient evidence, at the 5% significance level, to support the officer's belief?
1. State the null hypothesis in words AND statistical notation.
2. State the alternate hypothesis in words AND statistical notation.
3. Calculate the appropriate test statistic.
4. What is your decision in terms of this example?
5. What is your conclusion in relation to the original question?
A researcher believes that if she uses a different text the students will score differently on the standardized test but she doesn't know what the difference is. The test had a mean of 110 and a σ of 12.
The table shows the world's five largest crude oil producing countries and their total oil output in percentage for the years 2011 and 2012.
1. What is the difference between a programmable logic controller and an electromechanical relay control?
Find the probability of getting no multiples, 1 multiple, or 2 multiples of 3, and report the distribution in a table.
The team wins 55% of their night games, and 85% of their day games. According to today's newspaper, they won yesterday. What is the probability the game was played at night?
You have at least $30 in change in your drawer, consisting of dimes and quarters. Write an inequality that shows the different number of coins in your drawer.
consumption of alcoholic beverages by young women of drinking age has been increasing in the united kingdom the united
Assume the results of different games played in the series are independent of each other. Find the p.m.f. of the distribution of N := duration" of the baseball series.
A fire insurance wants to examine the relationship between the amount of fire damage in major residential fires to the distance between the burning house and the nearest fire station. A sample of 15 recent fires in a particular city was taken.
If the sample size increased by 50% but the computed sample variance remained the same, recompute the probability S2 ≤ 9.5. Repeat part (iii) when the sample size is decreased from the original value of 50 by 50%.
q1.a researcher in the west coast of the u.s. wants to estimate the amount of a newly discovered antibody in human
Horace Mann, principal of Jones Public School, has decided to construct a time series model to obtain a 2- and a 3-period moving average to forecast student enrollments for next term.
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