Recitation: Lab Review and Student's t-Test Analysis

Vocabulary flashcards covering enzyme kinetics, lab equipment, report structure, and Student's t-test statistical analysis based on the lecture recitation.

Optimum Temperature (Enzyme Activity)

The ideal temperature where an enzyme works best and fastest (around $35\,^{\circ}\text{C}\text{ to }40\,^{\circ}\text{C}$ in our lab).

Logger Pro

The computer software used in the lab to collect and show carbon dioxide ($CO_2$) data from plant sensors.

Variance ($s^2$)

A statistical calculation that shows how widely scattered your data points are from the average.

Standard Deviation ($s$)

The square root of variance, measuring the typical distance between individual data points and the average.

Student's t-Test

A statistical test comparing the averages of two groups to see if the difference between them is real or just pure luck.

$t_{\text{stat}}$ (or $t_{\text{calc}}$)

The test score calculated directly from your experimental data, always written as a positive number.

$$t_{\text{crit}}$$

The cutoff threshold from a reference table that your calculated score must beat to prove a real difference.

Degrees of Freedom ($df$)

The number of free choices in a dataset, found by adding both group sizes and subtracting two ($(n_1 + n_2) - 2$).

Alpha Value ($\alpha$)

The acceptable risk of random error, set to $0.05$ ($5\%$) to provide a $95\%$ confidence interval.

Null Hypothesis

The default assumption asserting that there is no true difference between two tested groups.

Rejecting the Null Hypothesis

The decision made when $t_{\text{calc}} > t_{\text{crit}}$, confirming that the difference between the two groups is real and meaningful.

Accepting the Null Hypothesis

The decision made when $t_{\text{calc}} < t_{\text{crit}}$, indicating that any difference between the groups is likely just due to chance.

$p$-Value

The calculated chance that your experimental results occurred by pure accident, with smaller numbers showing higher certainty.

Two-Sample t-Test Assuming Equal Variances

The Excel procedure chosen when both comparison groups share similar background variability, such as seeds taken from the same bag.

Data Analysis ToolPak

The optional Excel add-in feature required to calculate automated statistics and run tests.