A class of 30 students in an introductory statistics class took a 15-item quiz, with each item worth 1 point. The standard deviation for the resulting score distribution is 0. You know that: O everyone correctly answered the same number of items. an arithmetic error must have been made. about half of the scores were above the mean. the mean, median, and mode must all be zero.

Q: You throw a ball as far as you can 5 times, recording the distance for each throw: 165 feet, 184…

A: since only 5 observation is given we will consider them as sample (n = 5)and population (N = 100)…

Q: Iculate the mean and median and report the lower value of two.

A: Answer The sample size [n] = 10-7.4, -3.4, -2.7, -2.2, -1.9, -0.8, 0.3, 0.9, 0.9, 1.1The mean:The…

Q: A researcher measures the amount of food consumed by each dog in her lab. She finds that the mean…

A: It is given that mean amount of food is 12 oz and number of dogs is 16. The sum of squared…

Q: A sample of 104 motels is selected from a large urban area and the price for a night of lodging for…

A: n = 104Mean = 100SD = 13One motel charged $68 per night which is 13th percentile Another motel…

Q: Molly earned a score of 920 on a national achievement test. The mean test score was 825 with a…

A: Given that, The proportion of students had a higher score than Molly is,

Q: When dating someone, what matters more to you: looks or personality? This question was the focus of…

A: P value=0.0  Hypothesis. H0: μ1 − μ2 = 0 Ha: μ1 − μ2 ≠ 0 (claim)

Q: A successful basketball player has a height of 6 feet 8 ​inches, or 203 cm. Based on statistics from…

A: Consider X is a random variable defined as the height of a successful basketball player.The provided…

Q: Provide a set of 20 data points that has a mean of 20, a median of 25, an IQR of 10, and a sample…

A: Data should have mean of 20, a median of 25, an IQR of 10, and a sample standard deviation between 9…

Q: What does “statistically significant” mean in this context? (More than one answer is correct. Select…

A: Hypothesis Testing is a type of inferential procedure is statistics.

Q: During one of the Kahana Resort’s “Trivia Nights,” 480 guests took the test on “Island Trivia.”  The…

A: Introduction: Define X as the random variable of interest here, which denotes the score obtained by…

Q: The GMAC Insurance company reported that the mean score on the National Drivers Test was 67.5 with a…

A:

Q: There are two major tests of readiness for college, the ACT and the SAT. ACT scores are reported on…

A: From the provided information, For ACT score: Mean (µ) = 21.5 Standard deviation (σ) = 5.4 For SAT…

Q: the household rather than the male in the household. A coupon book was sent at random to either the…

A: Solution: Given information: n= 50 Sample size  xd= 1.5  Diffrence of sample mean sd=4.75 Difference…

Q: What proportion of a normal distribution is located above the mean?

A: z-score: z-score is a standardized score which tells about how many standard deviations does a data…

Q: ve an opinion about which population will have a higher mean score. Here are her hypotheses. H0:…

A: Given The data is as follows:

Q: A sample of 129 motels is selected from a large urban area and the price for a night of lodging for…

A: A sample of 129 motels is selected.

Q: The average and standard deviation for ACT scores are 20 and 3 respectively. average and standard…

A:

Q: A sample of 134 motels is selected from a large urban area and the price for a night of lodging for…

A: Let  be the price for a night of lodging for a single room.The percentile values:

Q: On a nationwide math test, the mean was 52 and the standard deviation was 4. If Roberto scored 85,…

A: The z score formula is,

Q: A population has mean 27 and standard deviation 12 . What is the data value that has a z-score of -2…

A: Given data, Mean=27 sd=12 z=-2 x=?

Q: On a nationwide math test, the mean was 51 and the standard deviation was 4. If Roberto scored 85,…

A: We have given the mean and standard deviation of a nationwide math test.Mean μ = 51Standard…

Q: On a nationwide math test, the mean was 72 and the standard deviation was 7. If Roberto scored 90,…

A: Given that, Mean = 72 Standard deviation = 7

Q: A student scored 31.9 on the mathematics section of the American College Test. The mean score for…

A: From the provided information, Mean (µ) and standard deviation (σ) of ACT exam score are 16 and 9.6.…

Q: Which test was better?. Gina took a midterm in her math class and her biology class. After she gets…

A: The objective is to calculate z score for math test for Gina. we have given  x=47 mean(x)=39…

Q: 5 points on his st. The mean was 70 standard deviation atively better on thein

A:

Q: Sarah entered her motorcycle in a slow race with 50 other contestants. She crossed the finish line…

A: It is required to state the formula for the number of standard deviations that the result was above…

Q: Randy took a standardized test that is normally distributed. He scored a 105 on the test. The…

A: Given  Mean=mu=94 , Standard deviation=sigma=6.2 X=105 X~Normal(mu=94,sigma=6.2)…

Q: In a city with three high schools, all the ninth graders took a Standardized Test, with these…

A: Given: X¯1=77n1=259X¯2=90n2=344X¯3=66n3=171

Q: 3; 8; -1; 1; 0; 4; -3; 2; -1; 5; 4; -2 what is the standard deviation for this sample?

A: Given, The 12 change scores are 3,8,-1,1,0,4,-3,2,-1,5,4,-2

Q: Sameer's score in a quiz was 25 and he was five standard deviations above the mean in this quiz. The…

A: Sameer’s score is 25. The mean score of quiz is 20. It is given that Sameer's score in a quiz was 25…

Q: You are told that a set of data includes one score which is 0.8.The standard deviation for the set…

A: According to the provided information. The data consist one value which is 0.8. Now, also given that…

Q: In the Social Psychology course, you receive a score of 77 on the second exam. You are told that the…

A: Solution: Let X be the score. From the given information, X=77, σ=8 and z=–0.75.