Your medical research team is investigating the standard deviation of the cost of a 30-day supply of a certain heart medication. A pharmaceutical company thinks that the standard deviation of the cost is less than $14. You want to support this claim. How would you write the null and alternative hypotheses? Ho: f

A real estate agent claims that mean household incomes in Fairfax and Arlington are equal. Draw 32 residents randomly from Fairfax neighborhood we found the average income is $82,750 with population standard deviation $2900; while from 30 Arlington residents, the average income  81,200 with with population  deviation $2225. f you don't trust its claim, what is the  H 0, and what is the H a ? If you support its claim, what is the  H 0, and what is the H a ?

answer 2

You are testing the claim that the mean GPA of night students is different than the mean GPA of day students. You sample 30 night students, and the sample mean GPA is 2.67 with a standard deviation of 0.97 You sample 45 day students, and the sample mean GPA is 2.86 with a standard deviation of 0.74 Calculate the test statistic, rounded to 2 decimal places

Now you know the range and interquartile range for the age variable...but you are concerned because both of these measures of variability are flawed (in fact, you can easily list the drawbacks of each measure because you have studied so well!). So, you realize it is also important to check out the standard deviation.You use SPSS and find that the standard deviation for the age variable is ________. Enter your answer rounded to two decimal places (i.e., 10.11, not 10, not 10.1, not 10.110).

Your medical research team is investigating the standard deviation of the cost of a​ 30-day supply of a certain heart medication. A pharmaceutical company thinks that the standard deviation of the cost is less than $17. You want to support this claim. How would you write the null and alternative​ hypotheses? H0​: ▼   sigma not equals 17σ≠17 sigma equals 17σ=17 sigma less than or equals 17σ≤17 sigma less than 17σ<17 sigma greater than or equals 17σ≥17 sigma greater than 17σ>17 Ha​: ▼   sigma less than or equals 17σ≤17 sigma not equals 17σ≠17 sigma greater than or equals 17σ≥17 sigma greater than 17σ>17 sigma equals 17σ=17 sigma less than 17

You are testing the claim that the mean GPA of night students is different than the mean GPA of day students.You sample 30 night students, and the sample mean GPA is 2.34 with a standard deviation of 0.6You sample 40 day students, and the sample mean GPA is 2.42 with a standard deviation of 0.67Calculate the test statistic, rounded to 2 decimal places

answer 1

Need help finding what t= to

A scientist has read that the mean birth weight, µ, of babies born at full term is 7.3 pounds. The scientist, believing that u is different from this value, plans to perform a statistical test. She selects a random sample of birth weights of babies born at full term and finds the mean of the sample to be 7.7 pounds and the standard deviation to be 1.5 pounds. Based on this information, answer the questions below. What are the null hypothesis (H) and the alternative hypothesis (H,) that should be used for the test? Hu is ? H:u is ? In the context of this test, what is a Type I error? A Type I error is ? fact, u is A the hypothesis that u is when, in Suppose that the scientist decides to reject the null hypothesis. What sort of error might she be making?