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Question: Public Policy and Political Science A technical panel investigating residential smoke alarms recommends that the sound emitted by the device (during a fire) should be at least 85 decibels at 10 feet away. In a random sample of 60 smoke alarms from homes in a large city, the sample mean decibel level (at 10 feet away) was x¯ = 84.88. Assume σ = 5.6.
a. Is there any evidence that the true mean decibel level produced by smoke alarms in this city is less than 85? Use a = 0.01 and compute the p value to draw a conclusion.
b. What is the smallest significance level at which this hypothesis test would be significant?
Using the annual number of employees as weights, what is the weighted mean for annual utility plant investment per employee during this period?
Percentile plot of 1000 differences between means , the difference of the average of 100 students doing stats and the average of 100 students doing macroeconomics
As of today, the interest rate in Countries X, Y, and Z, are similar. In the next month, Country X is expected to have a weak economy, while Countries Y and Z are expected to experience a 6% increase in economic growth.
Carry out a two-sample t test. State hypotheses and give the two sample means, the t statistic and its P-value, and your conclusion.
However, 21% of the students neither go to all the lectures nor buys the recommended textbook. What is the probability that a randomly chosen student who buys the textbook attends every lecture?
Add line-of-best fit (trend line/linear regression line) to your scatterplot. Write down the equation of the trend line below.
How would you apply radical expressions in everyday life? Give an example of the expression.
What type of sample is obtained in this Quick vote?- What do you think is meant by the message that "This is not a scientific poll?"
Alternative plans are being considered for an irrigation canal between a natural freshwater reservoir and an agricultural region in Balochistan. One of the plans is for the canal to pass through mountains via tunnels and also to cross a series of ..
Study About Doctors and Other Professionals
If there were 18 million users of handheld data devices of this kind on that day, what is the probability that a randomly chosen user could not use a device?
Past studies have shown that only 95% of booked passengers actually show up for the flight. What is the probability that exactly 99 booked passengers actually show up for the flight?
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