Data Analysis - course 4

Question 5 Fill in the blank: A data analyst uses _____ to determine whether an experiment or survey has meaningful results. approximation trial and error estimation hypothesis testing

hypothesis testing

Question 1 Fill in the blank: If a data professional calculates a statistical power of at least 80%, it is likely their experiment results are due to a _____ between the groups being compared, rather than random chance. 0 / 1 point real difference confirmed anomaly predicted connection slight similarity

real difference

Question 1 Fill in the blank: If a test is statistically _____, the results are less likely to be due to random chance and more likely to be due to a real difference between the groups being compared. significant repeatable connected precise

significant

In a survey about a new type of protein bar, 70% of respondents report they would buy the bar again. The margin of error for the survey is 4%. Based on that margin of error, what range reflects the population's true response?

66-74%

Question 2 A delivery company stores customer data in a delivery database and a customer relationship database. When a customer changes their shipping address, the change is not reflected in the delivery database. This leads to the shipments being delivered to the wrong address. What data integrity problem does this scenario describe? A> Transfer B> Manipulation C> Gathering D> Replication

D> Replication

Question 7 A data professional copies a dataset from a USB drive to their computer. They accidentally unplug the USB before the process is complete, which causes the dataset on their computer to be incomplete. What data integrity problem does this scenario describe? Manipulation Cleaning Transfer Replication

Transfer

A data professional in the logistics industry wants to calculate the margin of error for a study about transportation route efficiency. They know the population size and sample size. What must they also know in order to accurately calculate margin of error? 1 / 1 point Testing methodology Distribution Correlation Confidence level

Confidence level

A high school principal estimates the total number of students who will attend an upcoming event. Assuming that the older students are unlikely to attend, the principal decides to only survey first- and second-year students. What is likely to result? A. Geographically limited sampling B. Unbiased sampling C. Sampling bias D. Random sampling

C. Sampling bias

Question 8 Which of the following statements accurately describe sample size, population, and confidence level? Select all that apply. Having an 80% confidence level is ideal, but most industries hope for 70-75%. Random sampling involves selecting a sample from a population so that every possible type of the sample has an equal chance of being chosen. When data professionals use sample size, they are using a part of a population that is representative of the population. Confidence level is the probability that a sample accurately reflects the greater population.

Random sampling involves selecting a sample from a population so that every possible type of the sample has an equal chance of being chosen. When data professionals use sample size, they are using a part of a population that is representative of the population. Confidence level is the probability that a sample accurately reflects the greater population.

Fill in the blank: Hypothesis testing is a process to determine whether a survey or _____ has meaningful results. sample data source experiment action item

experiment