Blog

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”

Select the statistical term that most closely matches the definition below: “A subset of the population, chosen in such a way that it is believed to represent the population”

A person’s height is an example of which measurement scale?

Select the statistical term that most closely matches the definition below: “The collection of information from every object in a population”

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 no less than 9 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.