Reference no: EM132178474
Consider the following two scenarios:
The mean height of coastal redwood trees is known to be 200 feet. In order to test whether a community of coastal trees were growing to be healthy in a park with high rates of tourism, a random sample of 20 trees were measured. It was found that for the 20 sampled trees, the average height was 197.5 feet with a standard deviation of 6.7. It is known that tree heights follow a normal distribution
The mean height of coastal redwood trees is known to be 200 feet. In order to test whether a community of coastal trees were growing to be healthy in a park with high rates of tourism, a random sample of 20 trees were measured. It was found that for the 20 sampled trees, the average height was 197.5 feet. It is known that tree heights follow a normal distribution with a standard deviation of 7.
Which of the following is correct:
A) In the second scenario, the population standard deviation is not known, therefore a z-test should be used.
B) In the second scenario, the population standard deviation is known, therefore a t-test should be used.
C) In the second scenario, the sample standard deviation is known, therefore a z-test should be used.
D) In the second scenario, the population standard deviation is known, therefore a z-test should be used.
|
Have you created things to share with online world
: Web 2.0 has created numerous channels for people to offer their own work for free-open source software, frees music, books, and artwork.
|
|
What is wardriving
: Give a summary (of at least one-page) covering what networking technologies are involved in Wardriving and potential problems caused by Wardriving.
|
|
Describe your market share and profits
: Describe your market share and profits, support with figures. Identify the market share in each round and describe the numbers, explain them
|
|
Sampling distribution of the sample mean
: There might be several true statements. Each correct answer gives a mark. In you select an answer incorrectly, a mark will be subtracted.
|
|
Normal distribution with a standard deviation of 7
: It is known that tree heights follow a normal distribution with a standard deviation of 7.
|
|
Create a program plan and then convert
: Create a program plan and then convert it into C++ statements. Practice debugging, declaring variables, file I/O, functions, arrays, sorting and searching array
|
|
Mean weight of chocolate per box
: Using the data they collected, the family would like to test whether µ, the mean weight of chocolate per box, is less than their original signature box.
|
|
Write your own version of a class template
: Write your own version of a class template that will create a dynamic stack of any data type.
|
|
What percentage of the test scores was at least 60
: a. What percentage of the test scores was at least 60? b. What percentage of the test scores was at most 89?
|