Blog

A person’s favorite beverage (tea, coffee, soda, etc.) would be an example of which measurement scale?

A survey was taken of students enrolled in STEM classes at Taft College. One of the questions asked which city the students live in, and one of the other questions asked about their major. The results are shown below. Use them to answer the probability question that follows.  Probability Table Bakersfield Taft Shafter Other Math 3 5 2 4 Chemistry 9 4 1 5 Biology 4 13 8 6 Engineering  14 15 2 1 Physics 3 1 0 2   What is the probability that a randomly selected student from this survey is a biology major given that they live in Taft?   Make sure to type in your answer as a decimal rounded to 3 decimal places. For example, if you thought the answer was 0.12345 then you would type in 0.123. 

Select the statistical term that most closely matches the definition below: “A numerical value that summarizes the entire population”

Suppose you are working on a political campaign. You are tasked to figure out what proportion of voters are in favor of your candidate. You want to be 96% confident within 6% of the true proportion. What sample size would be required in this scenario?

Suppose you are working on a political campaign. You are tasked to figure out what proportion of voters are in favor of your candidate. You want to be 90% confident within 1% of the true proportion. What sample size would be required in this scenario?

A study was conducted and it found that the mean annual salary for all California residents was $63,783 and the true standard deviation for all California residents was $7,240. Suppose you were to randomly sample 50 California residents. Use this information to answer the following question.  What is the probability that the average salary for the 50 individuals in your sample would be anywhere from $65,750 to $68,125? Make sure to type in your answer as a decimal rounded to 3 decimal places. For example, if you thought the answer was 0.54321 then you would type in 0.543.

The CBEST is a test that individuals in California must take before they can become substitute teachers at the K-12 level. One portion of the exam is devoted to mathematics and it consists of 50 multiple choice questions that each have 5 possible options. Suppose Jim took the CBEST test and decided to randomly guess on all 50 questions. Use this information to answer the following question.  What is the probability that Jim gets anywhere from 10 to 18 correct? Make sure to type in your answer as a decimal rounded to 3 decimal places. For example, if you thought the answer was 0.54321 then you would type in 0.543.

Suppose you are working on a political campaign. You are tasked to figure out what proportion of voters are in favor of your candidate. You want to be 98% confident within 5% of the true proportion. What sample size would be required in this scenario?

Age is an example of which measurement scale?

Select the statistical term that most closely matches the definition below: “A characteristic of interest about each individual element of a population or sample”