The length of human pregnancies from conception to birth varies according to a distribution that is approximately normal with a mean of 266 days and standard deviation of 16 days. Use StatCrunch to find the probability that the average pregnancy length for 6 randomly chosen women exceeds 270 days.

Statsville Credit Union is considering switching from having multiple lines (one for each teller) to having one single line for all tellers. They recorded a random sample of customer wait times (in seconds) using each method.  Multiple Lines:  252    324    348    372    402    462    462    510    558    600  Single Line:        390    396    402    408    426    438    444    462    462    462    Use StatCrunch to find the mean and standard deviation of the times using each method.  Based on these data, which method appears to be better?

The table lists the number of home runs hit and the number of wins of ten randomly selected Major League Baseball teams in the 2019 season. Home Runs   224   279   182   306   249   257   307   167   210   256 Wins   71   106   72   103   97   97   101   77   91   84 a.)  Use StatCrunch to find the scatterplot corresponds to the given data.  (Type the letter of the appropriate scatterplot into the answer box).               [scatterplot] b.) Based on the scatterplot graph, does the data represent a positive, negative or no linear correlation?  (Type either positive, negative, or no linear correlation into the answer box).              [correlation] c.)  Use StatCrunch to find the correlation coefficient r.            r = [r]   (Round to 2 decimals) d.)  Use StatCrunch to find the equation of the linear regression line.  Round each coefficient to 2 decimals.        

A random sample of 30 students was collected to find the heart rate of students. The results were: 52,  57,  64,  64,  65,  65,  66,  68,  68,  68,  68,  69,  70,  71,  71,  73,  73,  73,  74,  75,  78 78,  79,  79,  81,  82,  83,  84,  87,  89 a.)  You will make a frequency table with 6 classes.  Use the Honorlock calculator to find the class width.           [cw] b.)  Form a frequency table with 6 classes.     Class Limits    Frequency    [LL1] – [UL1]    [F1]    [LL2] – [UL2]    [F2]    [LL3] – [UL3]    [F3]    [LL4] – [UL4]    [F4]    [LL5] – [UL5]    [F5]    [LL6] – [UL6]    [F6] c.)  What is the distribution shape:  skewed left, skewed right, bell shaped, or uniform?          [shape]

Scores on the Critical Reading part of SAT exam in recent year were roughly normal with mean of 495 and standard deviation of 118. Use StatCrunch to find the probability that the average score for 30 students exceeds 475.

[Chapter  22. The Sun, The Stars, and Deep Space] Astronomers describe the apparent brightness of stars using a scheme that classifies stars using a scale divided into __________, with the lowest number being the brightest and the largest being the faintest.

[Chapter  19. Climate and Climate Change] Based on the graph below, average annual surface temperatures are _________.

[Chapter 16. The Air We Breathe: Introducing the Earth’s Atmosphere] A __________ is used to measure __________.

[Chapter  19. Climate and Climate Change] According to one prediction, as shown in the map below, the greatest variation of warming will occur on the __________ continent.

[Chapter  22. The Sun, The Stars, and Deep Space] A __________ black hole forms from an individual star dying; a __________ black hole is made when a galaxy is formed.