Math Problem Statement
- 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.
- Alternative Hypothesis (H₁): The average number of nerds in a box is not 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 () and the sample standard deviation ().
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:
Where:
- = sample mean
- = sample standard deviation
- = sample size (30 in this case)
- = 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 degrees of freedom, we will use the t-distribution to find the critical value . Compare the calculated t-statistic with the critical value:
- If , reject the null hypothesis .
- Otherwise, fail to reject .
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:
- What are the actual counts of nerds in the 30 boxes?
- Is the population standard deviation known, or should we proceed with the t-test?
- Are there any other assumptions to consider, like whether the data follows a normal distribution?
- Would you like to see the critical value calculations based on your degrees of freedom?
- 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.
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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
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