The weights of 60 females in a physical education class are normally distributed with a mean of 135 pounds and a standard deviation of 9.5. Find the percentage of females that weigh more than 150 pounds. 5.3% O 10.2% O 5.7% O 7.9%
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- According to the Carnegie unit system, the recommended number of hours students should study per unit is 2. Are statistics students' study hours different from the recommended number of hours per unit? The data show the results of a survey of 15 statistics students who were asked how many hours per unit they studied. Assume a normal distribution for the population. 0.4, 1.7, 0.8, 0.1, 0, 1.6, 3, 2.8, 3.2, 0.7, 0, 0.6, 1.2, 0, 0.9 What can be concluded at the a = 0.05 level of significance? a. For this study, we should use Select an answer b. The null and alternative hypotheses would be: Ho: ? O Select an answer H1: Select an answer ? c. The test statistic ? (please show your answer to 3 decimal places.) d. The p-value = (Please show your answer to 4 decimal places.) e. The p-value is ? O a f. Based on this, we should Select an answer the null hypothesis.The commute time for Cypress College students who drive from their home to the college follows a normal distribution with a mean of 26 minutes and a standard deviation of 8 minutes. What percent of students have a commute time between 20 and 30 minutes? O 51% 36% 38% O 46% 49%The highway mileage (mpg) for a sample of 10 different models of a car company can be found below. 35 50 30 29 42 44 33 32 44 43 Find the mode: Find the midrange: Find the range: Now use technology, find the standard deviation: (Please round your answer to 2 decimal places.)
- According to the Carnegie unit system, the recommended number of hours students should study per unit is 2. Are statistics students' study hours different from the recommended number of hours per unit? The data show the results of a survey of 15 statistics students who were asked how many hours per unit they studied. Assume a normal distribution for the population. 1.7, 3.7, 1.6, 0.8, 4.6, 3.7, 4.2, 1.1, 0.7, 2.5, 2.5, 2.8, 3.8, 1.7, 3.7 What can be concluded at the αα = 0.10 level of significance? The null and alternative hypotheses would be: Please provide number H0:H0: mean = __?___ H1:H1: mean not equal to __?__ The test statistic t= __?__ (please show your answer to 3 decimal places.) The p-value = __?__ (Please show your answer to 4 decimal places.)At a local high school, GPA's are normally distributed with a mean of 3.0 and standard deviation of 0.6. The middle 70% of the GPA values range from _____ to _____.In the 1992 presidential election, Alaska's 40 election districts averaged 2125 votes per district for President Clinton. The standard deviation was 564. (There are only 40 election districts in Alaska.) The distribution of the votes per district for President Clinton was bell-shaped. Let X = number of votes for President Clinton for an election district. (Source: The World Almanac and Book of Facts) Round all answers to two decimal places. a. What is the distribution of X? X - N( b. Is 2125 a population mean or a sample mean? | Select an answer c. Find the probability that a randomly selected district had fewer than 1995 votes for President Clinton. d. Find the probability that a randomly selected district had between 2187 and 2311 votes for President Clinton. e. Find the third quartile for votes for President Clinton. Helpful videos: P(x a number) 2, P(x is between two numbers) 2, Finding a percentile 2, Using the invNormal with greater than problems 2, Finding the IQR Hint 7…
- The annual ground coffee expenditures for households are approximately normally distributed with a mean of $46.34 and a standard deviation of $10.00. a. Find the probability that a household spent less than $30.00. b. Find the probability that a household spent more than $50.00. c. What proportion of the households spent between $20.00 and $30.00?On a construction site, the amount of dirt scooped by a forklift machine is normally distributed with a mean of 300 pounds per scoop and a standard deviation of 60 pounds per scoop. 35% of the scoops will involve lifting less than how many pounds of dirt? O360.19 347.61 O276.88 300 323.12A student randomly selects 10 paperbacks at a store. The sample standard deviation is $1.50. Construct a 95% confidence interval for the population standard deviation, o. Assume the data are normally distributed. Don't write the dollar sign in your answers. Lower = Upper =
- M2As a group, the Dutch are among the tallest people in the world. The average Dutch man is 184 cm tall - just over 6 feet. The standard deviation of men's height is about 8 cm. Assuming the distribution is approximately Normal, use the 68-95-99.7 Rule to sketch a model for the heights of Dutch men. What fraction of Dutch men should be less than 190 cm tall? type your answer... % What proportion of Dutch men should be taller than 205 cm tall? type your answer... %The highway mileage (mpg) for a sample of 10 different models of a car company can be found below. 48 43 24 39 27 43 46 26 22 49 Find the mode: Find the range: Estimate the standard deviation using the range rule of thumb: