this is statistics course and I need help with answering these questions.Thank you. You can search definition from google

D Question 40 1 pts A researcher is interested in studying the rate of heartworms in stray dogs and cats in the local area. They are able to acquire a dataset of animal intakes from the largest animal shelter in their area, and from this dataset, choose 100 stray dog and cat intakes at random. What is the sample, sampling frame, and population of this study, respectively? The 100 stray dogs and cats chosen at random from the dataset, the dataset of animal intakes from the local shelter, stray dogs and cats in the local area. Stray dogs and cats with heartworms, the 100 stray dogs and cats chosen at random from the dataset, stray dogs and cats in the local area. The 100 stray dogs and cats chosen at random from the dataset, the dataset of animal intakes from the local shelter, stray dogs and cats with heartworms. The dataset of animal intakes from the local shelter, stray dogs and cats in the local area, all stray dogs and cats nationwide. The number of stray dogs and cats found to have heartworms, the 100 stray dogs and cats chosen at random from the dataset, stray dogs and cats in the local area.D Question 30 1 pts Stacy has a Maine Coon cat, one of the largest breeds of domestic cats. She suspects her cat may be slightly overweight, so she decides to do some research on the average weight of all Maine Coon cats. She finds a database online of over 10,000 feline veterinary records, and decides to take five samples of 30 cats from this database to try to determine the mean weight of the Maine Coon breed. Which of the following is true? The values of the population parameter will vary from sample to sample. The parameter has a sampling distribution with the sample statistic as its mean. The sampling statistic can be estimated from the population parameter. The values of the sampling statistic will vary from sample to sample. O The values of the parameter will vary according to the sampling distribution.Question 25 1 pts Researchers want to study the effect of using a whitening tray (a mouthpiece-shaped tray filled with a whitening solution) in conjunction with a whitening toothpaste to improve the whiteness of patients' teeth. Suppose that a group of 50 volunteers are divided into two groups: one that will use a whitening toothpaste, and one that will use a whitening toothpaste in addition to a whitening tray for 15 minutes per day. Which of the following is not a valid method for reducing bias in this experiment: O Single-blinding Double-blinding O Blocking for gender Randomization O Replication