If an animal cell has a diploid number 2n = 18, how many chromosomes would be present in each of its gametes?

When a human egg is fertilized by a sperm, the sex of the developing embryo is determined:

A researcher is studying the effects of aspirin on heart rate. He believes that aspirin will lower heart rate. He has 2 groups the treatment group receives 80mg of aspirin for a week () the control group received a placebo () and their heart rates are compared. Below is his data in which heart rate is measured in beats per minute. He sets his alpha level at .05 and uses a directional test. Placebo             Aspirin [a]                        58 [b]                        52 [c]                        54 [d]                        60 Use the above data to calculate the observed t-score. **Report your answer to 4 decimal places.

The standard deviation of the sampling distribution of the difference between two independent means is called the:

The degrees of freedom for the independent groups t test are equal to:

The standard error of the difference indicates how much _____ will occur, on the average.

The homogeneity of variance assumption states

If a mean difference is 5, the estimated standard error of a mean difference is 4 and the nondirectional critical value of t for an alpha level of .05 is 2, what is the 95% confidence interval for the mean difference

A woman who can roll her tongue (presumably dominant) is married to a man who cannot roll his tongue. Two of their four children can roll their tongues and two cannot. If A= roll tongue and a= cannot roll tongue, then what is the genotype of the parents?

What would be the genotypic ratio of the following monohybrid cross: Aa x Aa?