Well its pretty obvious that it cant be A the answer will be E) because abc are connected and abd are as well so the answer will be e
Answer:
Step-by-step explanation:
The sign will be Positive because there are two negatives
Answer:
We fail to reject the null hypothesis that the average content of containers of the lubricant is 10 liters, this at the significance level of 0.01
Step-by-step explanation:
Let X be the random variable that represents the content of a container of the lubricant. We have observed n = 10 values, = 10.06 and s = 0.2459. We assume that X is normally distributed.
We have the following null and alternative hypothesis
vs (two-tailed alternative)
We will use the test statistic
because we have a small sample size. And the observed value is
if is true, then T has a t distribution with n-1 = 9 degrees of freedom.
The rejection region for a two-tailed alternative and a significance level of 0.01 is given by RR = {t | t < -3.2498 or t > 3.2498}, where 3.2498 is the value such that there is an area of 0.005 above this number and under the density of the t distribution with 9 df.
Because the observed value 0.7716 does not fall inside RR, we fail to reject the null hypothesis.
Answer:
The probability that at least one of the 20 4th graders is addicted to comic books is 0.12.
Step-by-step explanation:
Let X = number of hours a 4th grader reads comics and Y = number of 4th grader addicted to reading comics.
The random variable X is continuous and follows a normal distribution with mean, μ = 6 hours and standard deviation, σ = 2 hours.
And the random variable Y is discrete and follows a binomial distribution with success defined as a 4th grader is addicted to reading comics.
Compute the probability that a 4th grader is addicted to reading comics as follows, i.e. determine the value of P (X > 11) .
Use the <em>Z</em>-table for the probability value.
Now compute the probability that out of 20 fourth graders at least 1 is addicted to comics as follows:
The Binomial probability function is:
Compute the value of as follows:
Thus, the probability that at least one of the 20 4th graders is addicted to comic books is 0.12.