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# Skylar

• ### Help with stat homework?

Julia thinks that she has a special relationship with the number 6. In particular, Julia thinks that she would roll a 6 with a fair 6-sided die more often than you'd expect by chance alone. Suppose p is the true proportion of the time Julia will roll a 6.

(a) State the null and alternative hypotheses for testing Julia's claim. (Type the symbol "p" for the population proportion, whichever symbols you need of "<", ">", "=", "not =" and express any values as a fraction e.g. p = 1/3)

H0 =

Ha =

(b) Now suppose Julia makes n = 30 rolls, and a 6 comes up 6 times out of the 30 rolls. Determine the P-value of the test:

P-value =

(c) Answer the question: Does this sample provide evidence at the 5 percent level that Julia rolls a 6 more often than you'd expect?

(Type: Yes or No)

1 AnswerMathematics6 months ago
• ### Help with stats?

The contents of 40 cans of Coke have a mean of x⎯⎯⎯=12.15 and a standard deviation of s=0.12. Find the value of the test statistic t for the claim that the population mean is μ=12.

Mathematics6 months ago
• ### Help with a probability question?

The number of pizzas consumed per month by university students is normally distributed with a mean of 11 and a standard deviation of 3.

A. What proportion of students consume more than 12 pizzas per month?

Probability =

B. What is the probability that in a random sample of size 12, a total of more than 108 pizzas are consumed? (Hint: What is the mean number of pizzas consumed by the sample of 12 students?)

I'm mainly having issues with B. I don't know how to find the mean of the sample sie

1 AnswerMathematics6 months ago
• ### Help with stats homework?

The number of pizzas consumed per month by university students is normally distributed with a mean of 11 and a standard deviation of 3.

A. What proportion of students consume more than 12 pizzas per month?

Probability =

B. What is the probability that in a random sample of size 12, a total of more than 108 pizzas are consumed? (Hint: What is the mean number of pizzas consumed by the sample of 12 students?)

Mathematics6 months ago
• ### Help with stats?

The lengths of a certain type of chain are approximately Normally distributed with a mean of 2.6 cm and a standard deviation of 0.2 cm.

Find the value of ℓ such that P(L>ℓ)=0.01

How do I figure this out?

1 AnswerMathematics6 months ago
• ### Confused with stat homework?

How do I find the margin of error? Please don't just do the homework for me I need to know how to do it myself

Homework:

A poll is taken in which 358 out of 575 randomly selected voters indicated their preference for a certain candidate.

Find the margin of error for this 99% confidence interval for p.

2 AnswersMathematics7 months ago
• ### Help with Stat homework?

The number of pizzas consumed per month by university students is normally distributed with a mean of 13 and a standard deviation of 4.

A. What proportion of students consume more than 15 pizzas per month?

Probability =

B. What is the probability that in a random sample of size 9, a total of more than 99 pizzas are consumed? (Hint: What is the mean number of pizzas consumed by the sample of 9 students?)

Probability =

How do I calculate this?

1 AnswerMathematics7 months ago
• ### Stat help?

A sample of 12 measurements has a mean of 28 and a standard deviation of 2.5. Suppose that the sample is enlarged to 14 measurements, by including two additional measurements having a common value of 28 each.

A. Find the mean of the sample of 14 measurements.

Mean =

B. Find the standard deviation of the sample of 14 measurements.

Standard Deviation =

How do I figure this out? I don't just want the answer I want to know how it's done. Thanks

1 AnswerMathematics7 months ago
• ### Help with Stat?

A variable of a population has a mean of μ=150 and a standard deviation of σ=21.

a. The sampling distribution of the sample mean for samples of size 49 is approximately normally distributed with mean_____and standard deviation ____.

How do I go about solving this?

.

1 AnswerMathematics7 months ago
• ### Stat Help!?

Find the following probabilities for the standard normal random variable z:

(a) P(−1.68≤z≤2.23)=

(b) P(−0.97≤z≤2.01)=

(c) P(z≤0.27)=

(d) P(z>−1.45)=

How do I go about figuring these out? I'm so confused and my professor isn't much help.

4 AnswersMathematics7 months ago
• ### Help with Stat?

Fact: the region under the standard normal curve that lies to the left of −1.42 has area 0.0778038.

Without consulting a table or a calculator giving areas under the standard normal curve, determine the area under the standard normal curve that lies to the right of 1.42.