A new gun-like machine is being tested to administer vaccines to patients. In order for the machine to get approval to be used in hospitals, the standard deviation for the amount of serum that is injected to the patient must be less than 0.063. In a sample of 25 injections made by the new machine, the standard deviation of the amount of serum injected was 0.057. Test whether the new machine can be used in hospitals. Use the a-0.10 level of significance. Write your answer in the following form Test Statistic, Critical Value, Conclusion

Discribe the scores in a sample that has a standard deviation of zero.

find the standard deviation

Loretta, who turns 91 this year, has heard that the mean systolic blood pressure among the elderly is 120 millimeters of mercury (mm Hg), but she believes that the actual value is higher. She bases her belief on a recently reported study of 19 randomly selected, elderly adults. The sample mean systolic blood pressure of the adults in the study was 121 mm Hg , and the sample standard deviation was 20 mm Hg. Assume that the population of systolic blood pressures of elderly adults is normally distributed. Based on the study, at the 0.1 level of significance, can it be concluded that μ , the mean systolic blood pressure among elderly adults, is greater than 120 mm Hg? Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places and round your answers as specified in the table. (a) State the null hypothesis H0? and the alternative hypothesis H1? . H0:? H1:? (b) Determine the type of test statistic to…