Math Problem Statement

  1. Bing is a student researcher trying to disprove Bong’s claim that there are, on the average, 500 nerds in a box. A random sample of 30 boxes of nerds are examined and the following counts were observed. Test the claim of Bong that there are, on the average, 500 nerds in a box at α = 0.01.

Solution

To test Bong’s claim that there are, on average, 500 nerds in a box using Bing’s sample data, we will perform a hypothesis test. Since we are testing the average count, this will be a one-sample t-test (if the population standard deviation is unknown) or a z-test (if the population standard deviation is known).

Here are the steps to perform the hypothesis test:

Step 1: Set up the hypotheses

  • Null Hypothesis (H₀): The average number of nerds in a box is 500. H0:μ=500H₀: \mu = 500
  • Alternative Hypothesis (H₁): The average number of nerds in a box is not 500. H1:μ500H₁: \mu \neq 500

This will be a two-tailed test since we are checking if the average is not equal to 500.

Step 2: Identify the significance level (α)

The significance level is given as α = 0.01.

Step 3: Gather the sample data

You have mentioned a random sample of 30 boxes, but the actual counts of nerds in each of the 30 boxes are not provided. To proceed with the test, I need the observed counts from the sample to calculate the sample mean (xˉ\bar{x}) and the sample standard deviation (ss).

Step 4: Calculate the test statistic

Once the data is available, we will calculate the test statistic. If the population standard deviation is unknown, the formula for the t-statistic is:

t=xˉμsnt = \frac{\bar{x} - \mu}{\frac{s}{\sqrt{n}}} Where:

  • xˉ\bar{x} = sample mean
  • ss = sample standard deviation
  • nn = sample size (30 in this case)
  • μ\mu = population mean (500)

Step 5: Determine the critical value and make a decision

For a two-tailed t-test with a significance level of 0.01 and n1=29n - 1 = 29 degrees of freedom, we will use the t-distribution to find the critical value tα/2t_{\alpha/2}. Compare the calculated t-statistic with the critical value:

  • If t>tα/2|t| > t_{\alpha/2}, reject the null hypothesis H0H₀.
  • Otherwise, fail to reject H0H₀.

If you provide the observed counts of nerds in the 30 boxes, I can help you calculate the necessary values and complete the test. Do you have the sample data?

Follow-up Questions:

  1. What are the actual counts of nerds in the 30 boxes?
  2. Is the population standard deviation known, or should we proceed with the t-test?
  3. Are there any other assumptions to consider, like whether the data follows a normal distribution?
  4. Would you like to see the critical value calculations based on your degrees of freedom?
  5. Should we calculate a confidence interval for the mean number of nerds in a box?

Tip: When conducting a hypothesis test, always visualize the problem with a distribution curve to better understand the critical regions.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Hypothesis Testing
Statistics
One-sample t-test
Two-tailed test

Formulas

t = (x̄ - μ) / (s / √n)
Null Hypothesis: H₀: μ = 500
Alternative Hypothesis: H₁: μ ≠ 500

Theorems

Central Limit Theorem
T-distribution properties

Suitable Grade Level

College level or advanced high school statistics