Answer:
At first glance, it may seem as if it's perfectly legal to copy content from a website. But is it? The short answer to this question is "no," unless you've obtained the author's permission. In fact, virtually all digital content enjoys the same copyright protections as non-digital, "offline" content.
Explanation:
Answer:
Both are normal distributions but standard normal distribution is a particular case of Normal distribution when the mean is 0 and standard deviation or variance is 1. This makes Y a “Standard” distribution. So basically X is Normally distributed and Y is “Standard” normally distributed.
Cos(180) = -1 if I’m not wrong, hope this helps
Answer: only change the appearance of a substance
Explanation:
Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula.
Answer:

Explanation:
Given
--- sample
--- confidence interval
Required
Determine the critical value
Start by calculating the degrees of freedom (df)



Next, calculate the significance level

This gives:

Express percentage as decimal



Next, we look at the t table at

and

We have the critical value to be:
