create a survey results that have a sample proportion of 23%
the lenghts of a certain species of fish was found to be normally distributed. the mean lenghts is 77 cm with a standard deviation of 13cm. In a school of 380 of these fish how many would be longer than 64cm
23% of what?
Second post:
Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to Z score. Multiply by 380.
To create survey results with a sample proportion of 23%, you can follow these steps:
1. Determine the sample size: Decide how many individuals or participants you want to include in your survey. This will be the total number of people who responded to the survey.
2. Calculate the desired sample proportion: Multiply the sample size by 0.23 (23% expressed as a decimal) to get the number of survey respondents who should fall into the specific category or have a particular characteristic you are interested in.
3. Ensure the sample size is appropriate: Depending on the population size and the desired level of precision, you might need to use a specific formula to calculate the sample size. If the sample size you initially determined is not sufficient, you may need to adjust it accordingly.
4. Conduct the survey: Distribute your survey questionnaire to the chosen participants. Make sure to collect responses from the desired number of individuals based on the sample size and the calculated proportion.
5. Analyze the results: Once you have gathered all the survey responses, calculate the sample proportion by dividing the number of people who responded with the desired characteristic by the total sample size. Multiply the result by 100 to convert it into a percentage.
For example, if your desired sample proportion is 23% and your sample size is 500, you would aim to have approximately 500 * 0.23 = 115 respondents with the desired characteristic. After collecting the responses, you would calculate the actual sample proportion by dividing the number of participants showing the characteristic by 500 and multiplying the result by 100.