Inference for a Population Mean
Confidence Interval & Significance Test
Find Sample Size
Enter Data:
From Textbook
Your Own
Summary Statistics
Choose Dataset:
TV Hours
eBay Auction
Hours Emailing
Social Security Payments
Cereal Sugar Content
Weekly Work Hours (Males, 2012)
Weekly Work Hours (Females, 2012)
Weight Change
Airbnb Rentals NYC
Bank Account Balance
Lendingclub Loans
Cell Phone Reaction Times
Weekly Work Hours (Males, 2018)
Weekly Work Hours (Females, 2018)
Enter or copy & paste numbers into the Observation box below, separated by spaces or commas.
Enter the sample size, mean and standard deviation below.
Name of Variable:
Observations:
0 1 3 3 4 4 5 6 7 9 10 11 11 12 12 14 14 15 16 18
Select Plot Type:
Histogram & Boxplot
Dotplot
Adjust Size of Dots
Select Dot Size:
Select Bin Width:
Adjust Bin Size
Select Binwidth:
Sample Size:
Sample Mean:
Sample Std. Dev.:
Type of Inference:
Confidence Interval
Significance Test
Confidence Level:
Interval, Lower or Upper Bound?
Interval
Lower
Upper
Null value μ
0
:
Alternative:
Two-sided
Less
Greater
Options:
Show
t-score
for Margin of Error
Select Range of x-Axis
Select Lower and Upper Limit:
Show More Descriptive Statistics
More Info on Dataset
Plot of Data
Plot of Interval
Show Degrees of Freedom
Decision Reject/Not Reject
Significance Level (in %)
Show More Descriptive Statistics
More Info on Dataset
Plot of Data
Plot of t-Distribution
Here, you can find the sample size necessary to achieve a desired margin of error for your confidence interval.
Desired Confidence Level:
Desired Margin of Error:
±
Provide a Guess for the Population Standard Deviation:
Specify Directly
6-Sigma Rule
Provide Guess for σ:
What are the smallest and larges values that you can imagine in your study population?
to
Options:
Interval, Lower or Upper Bound?
Interval
Lower
Upper
Plot Sample Size vs. Margin of Error