What is the t statistic of a repeated measures study?
A researcher conducts a repeated-measures study to evaluate a treatment with a sample of n = 16 participants and obtains a t statistic of t = 1.94. The treatment is expected to increase scores and the sample mean shows an increase.
How many samples are used in an independent measures research study?
An independent-measures research study uses two samples, each with n = 12 participants.If the data produce a t statistic of t = 2.08, then which of the following is the correct decision for a two-tailed hypothesis test?
What is the purpose of lab 9 cellular respiration?
Lab 9 Cellular Respiration Experiment 1: Fermentation by Yeast Yeast cells produce ethanol, CH50, and carbon dioxide, CO2, during alcoholic fermentation. In this experiment, you will measure the production of Co, to determine the rate of anaerobic respiration in the presence of different carbohydrates with a simplified respirometer.
What is the t statistic for two samples with N 8?
Increase the likelihood of rejecting H0 and have little or no effect on measures of effect size. Two samples, each with n = 8, produce an independent-measures t statistic of t = -2.15.Which of the following decisions is justified for a two-tailed hypothesis test?
Case study
1.1 Migraine and accupuncture. A migraine is a particularly painful type of headache, which patients sometimes wish to treat with acupuncture.
Data basics
1.3 Identify study components, Part I. Identify (i) the cases, (ii) the variables and their types, and (iii) the main research question in the studies described below.
Overview of data collection principles
1.7 Generalizability and causality, Part I. Identify the population of interest and the sample in the the studies described in Exercise 1.3. Also comment on whether or not the results of the study can be generalized to the population and if the ndings of the study can be used to establish causal relationships.
Observational studies and sampling strategies
1.11 Propose a sampling strategy. A large college class has 160 students. All 160 students attend the lectures together, but the students are divided into 4 groups, each of 40 students, for lab sections administered by different teaching assistants.
Experiments
1.19 Vitamin supplements. In order to assess the effectiveness of taking large doses of vitamin C in reducing the duration of the common cold, researchers recruited 400 healthy volunteers from staff and students at a university.
Examining numerical data
1.23 Mammal life spans. Data were collected on life spans (in years) and gestation lengths (in days) for 62 mammals. A scatterplot of life span versus length of gestation is shown below. 67
Considering categorical data
1.47 Antibiotic use in children. The bar plot and the pie chart below show the distribution of pre-existing medical conditions of children involved in a study on the optimal duration of antibiotic use in treatment of tracheitis, which is an upper respiratory infection.
What is a lab in biology?
LAB 1. Develop a hypothesis relating to the amount of dissolved oxygen measured in the water sample and the number of fish observed in the body of water. If more oxygen is added to a body of water, the number of fish will also increase. LAB 1.
What is the dependent variable of Sally's blood pressure?
The dependent variable is Sally's blood pressure level and the independent variables are exercising and eating healthy. The negative control is Sally not exercising and eating fatty foods and the positive control is Sally exercising and eating healthy.
What is the hypothesis that a plant will grow faster on a window sill?
The hypothesis is: If a plant is placed on a window sill, it will grow faster than a plant placed on a coffee table in the middle of the living room. The null hypothesis is: If a plant is placed on a window sill, it will grow at the same rate as a plant placed on a coffee table in the middle of the living room.