Post pairs of variables that exhibit positive correlation, negative correlation and no correlation. Could any of the proposed correlated variables be the result of causation? How could an experiment be designed to establish causation? Would it be ethical to do such an experiment? What percentage of the variation in the response variable do you think can be explained by the predictor variable? Do you think there are any lurking variables in your situation?

Sample Student Response

Positive Correlation: rain and the rate the grass grows. Yes there is causation. We could do an experiment to measure the effect or rain on grass growth rate. We can just observe this, but if we want to say causation we need experimentation. I would guess about 75% of the variation in grass growth rate could be explained by the amount of rainfall. Lurking variables might be temperature, fertilizer, sunshine, type of soil...

Negative Correlation: The more I study the less free time I have. Yes there is potential causation. We could design an experiment on this to see if additional studying does reduce free time for people. This may be unethical if it would negatively affect a student’s grade, so it might be best to just do an observational study. I would guess about 50% of the variation in free time could be explained by the amount to study time. Lurking variables might be hours at the workplace, family obligations, sickness, laziness,...

No Correlation: A person’s head circumference and the quantity of text messages a day. The rest of these questions are moot.

1. As we have seen in class, hypothesis testing, and confidence intervals are the most common inferential tools used in statistics. Imagine that you have been tasked with designing an experiment to determine reliably if a patient should be diagnosed with diabetes based on their blood test results. Create a short outline of your experiment, including all the following:
   1. A detailed discussion of your experimental design. Detailed experimental design should include the type of experiment, how you chose your sample size, what data is being collected, and how you would collect that data. Sample size has to be 25 or less.

2. How is randomization used in your sampling or assignment strategy? Remember to discuss how you would randomize for sampling and assignment, what type of randomization are you using?
3. The type of inferential test utilized in your experiment. Include type of test used, number of tails, and a justification for this choice.
4. A formal statement of the null and alternative hypothesis for your test. Make sure to include correct statistical notation for the formal null and alternative, do not just state this in words.

5. A confidence interval for estimating the parameter in your test. State and discuss your chosen confidence level, why this is appropriate, and interpret the lower and upper limits.

6. An interpretation of your p-value and confidence interval, including what they mean in the context of your experimental design. Answer each part below. State your significance level, interpret your p-value, and make a decision on the null.

To illustrate the effects of driving under the influence​ (DUI) of​ alcohol, a police officer brought a DUI simulator to a local high school. Student reaction time in an emergency was measured with unimpaired vision and also while wearing a pair of special goggles to simulate the effects of alcohol on vision. For a random sample of nine​ teenagers, the time​ (in seconds) required to bring the vehicle to a stop from a speed of 60 miles per hour was recorded. Complete parts​ (a) and​ (b). ​Note: A normal probability plot and boxplot of the data indicate that the differences are approximately normally distributed with no outliers. LOADING... Click the icon to view the data table. ​(a) Whether the student had unimpaired vision or wore goggles first was randomly selected. Why is this a good idea in designing the​ experiment? A. This is a good idea in designing the experiment because reaction times are different. B. This is a good idea in designing the experiment because the sample size is not large enough. C. This is a good idea in designing the experiment because it controls for any​ "learning" that may occur in using the simulator. Your answer is correct. ​(b) Use a​ 95% confidence interval to test if there is a difference in braking time with impaired vision and normal vision where the differences are computed as​ "impaired minus​ normal." The​ 95% confidence interval is ​( nothing​, nothing​). ​(Round to the nearest thousandth as​ needed.)

​Normal, Upper X Subscript i
4.49
4.34
4.58
4.56
4.31
4.83
4.55
5.00
4.79
​Impaired, Upper Y Subscript i
5.86
5.85
5.51
5.29
5.90
5.49
5.23
5.63
5.63

Michael has a box of colored balls. It contains two red balls, three green balls, one purple ball, two yellow balls, and five blue balls. Michael will perform an experiment which goes as follows.

First, a ball is drawn from the box at random, the color of the ball is noted (R for red, G for green, etc.), and the ball is set aside (i.e. not replaced into the box). The next stage of the experiment depends on the color of the ball Michael draws. If the ball is red, he will draw another ball and note its color. If the ball he draws at the beginning is green, he will draw five more balls, simultaneously and at random, and note how many of the balls he has drawn are red. Otherwise (if the ball drawn at the beginning is neither green nor red), he will flip a coin and note the result (H for heads, T for tails). Thus, for example, BH, RR, and G2 are three possible outcomes of the experiment.

Let S denote the sample space of the experiment, and let E denote the event that the ball drawn at the beginning is blue.
What is n(S)?

What is n(E′)?

Andre's dog Fifi knows fifteen tricks, five of which are interesting. Fifi does a show by performing either two or three different tricks one after another. If the first two tricks are both interesting, she will perform a third trick; otherwise, she only performs two tricks.
How many different shows could Fifi do?

Python 3 Forming Functions

Define and complete the functions described below.
* function name: say_hi
* parameters: none
* returns: N/A
* operation:
just say "hi" when called.
* expected output:

>>> say_hi()
hi

* function name: personal_hi
* parameters: name (string)
* returns: N/A
* operation:
Similar to say_hi, but you should include the name argument in the greeting.
* expected output:

>>> personal_hi("Samantha")
Hi, Samantha

* function name: introduce
* parameters: name1 (string)
name2 (string)
* returns: N/A
* operation:
Here you are simply including the two names in a basic introduction.
* expected output:

>>> introduce("Samantha","Jerome")
Samantha: Hi, my name is Samantha!
Jerome: Hey, Samantha. Nice to meet you. My name is Jerome.

How do you write this code in JavaScript inside the head?

• Prompt the user for their first name.
• Remember you must save the value that the user enters so that you can use that value, therefore the prompt must be in an assignment statement.
• Prompt the user for their last name.
• Have an alert box pop up that contains the first name followed by a space and then the last name followed by a short message that you make up.
• Hint: you will concatenate the value of the variable used to store the first name with a string that contains a space, them the value of the variable that contains the last name and then the string that contains the message. Variable names are not enclosed in quotes – we want the value of the variable, not the name of the variable to appear. Strings are enclosed in quotes,

the December 31,2015, balance sheet of schism, inc., showed long-term debt of $1,410,000, and the December 31, 2016 balance sheet showed long-term debt of $1,551,000. the 20q6 income statement showed an interest expense of $102,800. what was the firm's cash flow to creditors during 2016?

The parts of the comparative I/S of a firm for the years of 2016 and 2017 looks as follows:

2016 2017

Sales $100,000 $105,000

COGS $40,000 $52,500

SG&A $10,000 $21,000

Based on the above information, forecast 2018 COGS. Put the nearest dollar amount without comma or dollar sign

Answer :

1) Company Name :

Year Start :

Founder Name :

Graph :-

(Graph must show the high and low point of Market Share/users)

2) Company Name :

Year Start :

Founder Name :

Graph :-

(Graph must show the high and low point of Market Share/users)

3) Company Name :

Year Start :

Founder Name :

Graph :-

(Graph must show the high and low point of Market Share/users)