how are the expected counts calculated when a chi-square goodness-of-fit test is conducted?

What is the null hypothesis for a chi-square test?

Which of the following statements are correct about Chi-Square test? (A) The only parameter of a Chi-Square distribution is its number of degrees of freedom. (B) The null hypothesis in given Chi-Square test is rejected when calculated value of variable exceed its critical value. (C) The rejection region in a goodness of fit test lies only in the right tail of the distribution. (D) The Chi-Square test is a parametric test. (E) At α =.05 and V = 1 the critical value of X2 is equal to Z-value at the same level of significance.

A geneticist crossed wild, gray-colored mice with white (albino) mice. All the progeny were gray. These progeny were intercrossed to produce an F2, which consisted of 198 gray and 72 white mice. Propose an hypothesis to ex- plain these results, diagram the crosses, and compare the results with the predictions of the hypothesis.

Mendel crossed pea plants that produced round seeds with those that produced wrinkled seeds and self-fertilized the progeny. In the F2, he observed 5474 round seeds and 1850 wrinkled seeds. Using the letters W and w for the seed texture alleles, diagram Mendel’s crosses, showing the genotypes of the plants in each generation. Are the results consistent with the Principle of Segregation?

On the basis of Mendel’s observations, predict the results from the following crosses with peas: (a) A tall (dominant and homozygous) variety crossed with a dwarf variety. (b) The progeny of (a) self-fertilized. (c) The progeny from (a) crossed with the original tall parent. (d) The progeny of (a) crossed with the original dwarf parent.