Question

viviana read that preschoolers watch 21 hours of tv each week. she believes that the preschoolers at her school watch less tv than the national average. she also learns that the national distribution for preschoolers watching tv is negatively skewed, and that the population standard deviation is 5 hours. viviana sends a survey home to the parents of 120 preschool children at her school. she discovers that the sample mean for her school is 19 hours. what statistical test should be used to analyze the data?

Answer 1

The test to use is a single sample t test because we are comparing a single sample mean to a known or hypothesized population mean.

What is a statistical test?

A statistical test allows you to make quantitative decisions about a process or processes. The goal is to determine whether there is enough evidence to "reject" a process conjecture or hypothesis. The null hypothesis is the name given to this hypothesis.

The one-sample t-test is a statistical hypothesis test used to see if an unknown population mean differs from a given value.

The one sample t test, also known as the single sample t test, is a statistical hypothesis test used to determine whether the mean calculated from sample data collected from a single group differs from a value specified by the researcher.

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