Home » Data Science » Machine Learning » When we’re using a normal approximation, the width of our confidence interval depends on the variance of the normal distribution. Recall that the variance of each sample is identical, but the variance of the average is divided by n. Therefore since dividing by a larger number makes a quantity smaller, the variance of the average of 10000 samples should be less than that for 1000 samples, so the second confidence interval should be tighter. Q: Practice More Questions From: Evaluating Machine Learning Models Created with Fabric.js 4.6.0 Similar Questions You want to measure the proportion of people with high blood pressure in a population. You sample 1000 people and find that 55% have high blood pressure with a 90% confidence interval of (50%, 60%).…Let’s see why F1 is used instead of the regular mean of precision and recall. Let’s say the mean of precision and recall is at least 0.75. Which of the following could be the true value of the…True or False: If t is larger than the longest survival time recorded in the dataset, then S(t) = 0S(t)=0 according to the Kaplan-Meier estimate.A data analyst is working with a data frame named customers. It has separate columns for area code (area_code) and phone number (phone_num). The analyst wants to combine the two columns into a single…A data analyst notices that their header is much smaller than they wanted it to be. What happened?You decide that you want to be able to adjust the width of the views and the data visualizations about electric vehicle sales, charging stations, and battery range. Which type of layout will enable…A data analyst is working with a data frame called salary_data. They want to create a new column named hourly_salary that includes data from the wages column divided by 40. What code chunk lets the…The _____ aesthetic makes some points on a plot more transparent, or see-through, than others.A data analyst wants to change their header to be one font size smaller. What should they add to their markdown syntax?Fill in the blank: An effective slideshow guides your audience through your main communication points, but it does not repeat every word you say. A best practice is to keep text to fewer than five…A big part of audience engagement is knowing how to eliminate less important details. What practice do you use to scan quickly through the data in order to identify the most important insights?Fill in the blank: A big part of engagement is knowing how to eliminate less important details. So, you use spotlighting to _____ the data in order to identify the most important insights.R packages include sample datasets. They also include reusable R functions and documentation about how to use the functions.Given an average risk reduction (ARR) of 0.2, on average, how many people need to receive the treatment in order to benefit one of them (NNT)?You are presenting to your stakeholders and want to convey confidence. How should your body language reflect your composure? Select all that apply. Created with Fabric.js 4.6.0 Practice More Questions Data Analysis 200+ Qs Machine Learning 100+ Qs