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You operate a non-pro?t in an e?ort to help reduce substance abuse in Humboldt County. To help secure a grant, you want to show that Humboldt county su?ers a higher percentage of substance abuse than the national average of 7%. You collect a random sample of 150 Humboldt county residents and ?nd that 20 are struggling with substance abuse. Do you feel con?dent this study will help you get the grant?
Use a 5% level of signi?cance.
1) Show that we can use the sampling distribution of sample proportions and write out what it is for this study.
2) State the random variable and the parameter.
3) Write the null and alternative hypotheses in words & symbols
What is the probability that the mean contents of a six-pack are less than 12 ounces and what is the chance I find at most two defectives in the sample
Using the data presented by Hand and colleagues (1994) and discussed in previous chapters, we would like to estimate the average age difference.
If the middle 68% of the 7th graders kids in a school are in the range of 5' 5" and 5' 11", what is the standard deviation (in inches)?
Data on distribution of cost for building effort, design work and testing effort.
Sales manager wishes to award sales representatives who earn the largest commissions a bonus of= $1,000 .He can award bonus to 20% of representatives. Determine cutoff point between those who earn bonus and those who don't?
how will increasing the sample size without changing the level of confidence affect the width of a confidence interval
Average speed of greyhound dogs is about 18.4 meters per second. A particular greyhound breeder claims that her dogs are faster than the average greyhound.
What is the probability that the first student is taking the class
Real estate, part 2. In the real estate research described in Exercise 29, 64% of homes for sale have garages, 21% have swimming pools, and 17% have both features. a) What is the probability that a home for sale has a garage, but not a pool?
to give a 99.9 confidence interval for a population mean ? you would use the critical valuea.z 2.576.b.z 1.960.c.z
consider the weibull distribution with shape parameter equal to 2.5 and shape rate parameter equal to 0.05a what is the
Describe an experiment that would allow comparison of the reduction in knee pain for those who did 1 hour of tai chi twice weekly to the reduction
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