1. Does Early Language Reduce Tantrums?

1.     Does Early Language Reduce Tantrums? A recent headline reads “Early Language Skills Reduce Preschool Tantrums, Study Finds,” and the article offers a potential explanation for this: “Verbalizing their frustrations may help little ones cope.” The article refers to a study that recorded the language skill level and the number of tantrums of a sample of preschoolers.

It is believed that 75% of American youth now have health insurance due to the health care law.

1.  It is believed that 75% of American youth now have health insurance due to the health care law. Suppose this is true and let X equal the number of American youth in a random sample of n = 15 with private health insurance. (a)   [1 point] How is X distributed? (b)   [1 point] Find the probability that X is at least 10? (c)   [1 point] Find the probability that X is at most 10? (d)   [1 point] Find the probability that X is equal to 10?

If we have an average score of 550 with standad deviation of 100, wih 80 people with an average score of 532what will be the conclusion with a .05…

If we have an average score of 550 with standad deviation of 100, wih 80 people with an average score of 532what will be the conclusion with a .05 level of significance being used. what is the H0 versus the H1 what is the comparison distribution what are the standard normal cut off values for a test with significance level of 0.05 what is the observed z score? how can i test my hypotheses and get to a conclusion what is the 95% confidence interval for the mean scores

One hundred teachers attended a seminar on mathematical problem solving. The attitudes of representative sample of 12 of the teachers were measured…

One hundred teachers attended a seminar on mathematical problem solving. The attitudes of representative sample of 12 of the teachers were measured before and after the seminar. A positive number for change in attitude indicates that a teacher’s attitude toward math became more positive. The twelve change scores are as follows. 4; 8; −1; 2; 0; 5; −3; 1; −1; 6; 5; −2 Part (a) What is the mean change score? (Round your answer to two decimal places.) Part (b) What is the standard deviation for this sample? (Round your answer to two decimal places.) 3.54

the average salary for graduates entering the actuarial field is $40,000. if the salaries are normally distributed with a standard deviation of $5000…

the average salary for graduates entering the actuarial field is $40,000. if the salaries are normally distributed with a standard deviation of $5000 find the probabilty that  a. an individual graduate will have a salary  over $45,000 b. a group of nine graduates will have a group average over $45,000