a random sample of size 11 from a normal distribution has standard deviation  s=98. test Ho: standard deviation=70 versus H1: standard deviation >70. use the a at 0.05 level of significance

Babies: A sample of 25 one-year-old girls had a mean weight of 24.1 pounds with a standard deviation of 4.3 pounds. Assume that the population of weights is normally distributed. A pediatrician claims that the standard deviation of the weights of one-year-old girls is greater than 7 pounds. Do the data provide convincing evidence that the pediatrician's claim is true? Use the =α0.05 level of significance.

The heights of the 430 Candidates for the Elite Military Unit have an approximate normal distribution with mean, μ = 79 inches and a standarddeviation, σ = 3.89 inches. For the height of 77 inches , calculate the z-score and interpret it using a complete sentence.

A data set of lumber estimates(dollars) has a mean of 5 and a standard deviation of 4.739, calculate the z-score of 15.321542. Z-Score = [three decimal places]

Many people believe that the average number of Facebook friends is 328. The population standard deviation is 32.2. A random sample of 60 high school students in a particular county revealed that the average number of Facebook friends was 340. At α = 0.05, is there sufficient evidence to conclude that the mean number of friends is greater than 328?

A basketball analyst recently claimed that the average number of passes per possession in basketball today is less than 5. A random sample of 40 possessions had a mean number of passes of 4.1. The standard deviation of all possessions is known to be 2.4. Test the claim with 0.01 level of significance.

The mean SAT score in mathematics is 588. The standard deviation of these scores is 47. A special preparation course claims that it's graduates will score higher on average than the mean score 588. A random sample of 150 students completed the course, and their mean SAT score in mathematics was 591. At the 0.1 level of significance,can we conclude that the preparation course does what it claims? Assume that the standard deviation is also 47. Perform a one tailed test

The blood platelet counts of a group of women have a bell-shaped distribution with a mean of 253.8 and a standard deviation of 61.7. What is the approximate percentage of women with platelet counts between 192.1 and 315.5?

Systolic blood pressure levels above 120 mm Hg are considered to be high. For the 100 systolic blood pressure levels listed in the accompanying data​ set, the mean is 128.86000 mm Hg and the standard deviation is 15.28254 mm Hg. Assume that a simple random sample has been selected. Use a 0.01 significance level to test the claim that the sample is from a population with a mean greater than 120 mm Hg.LOADING... Click the icon to view the data set of systolic blood pressure levels. the attachement is listed below.  and the systolic blood pressure data is listed below       Body and exam measurements are from 100 subjects. SYSTOLIC is systolic blood pressure (mm…