# Get help with high school statistics and probability problems

Recent questions in Statistics and Probability
Study design Answered
Cabiolab 2020-11-05

### Do Left-Handers Die Earlier? According to a study published in the Journal of the American Public Health Association, lefthanded people do not die at an earlier age than right-handed people, contrary to the conclusion of a highly publicized report done 2 years earlier. The investigation involved a 6-year study of 3800 people in East Boston older than age 65. Researchers at Harvard University and the National Institute of Aging found that the “lefties” and “righties” died at exactly the same rate. “There was no difference, period,” said Dr. J. Guralnik, an epidemiologist at the institute and one of the coauthors of the report.

ka1leE 2020-11-05

### A croissant shop has plain croissants, cherry croissants, chocolate croissants, almond croissants, apple croissants, and broccoli croissants. How many ways are there to choose 6 dozen croissants?

Scatterplots Answered
he298c 2020-11-05

### Sketch a scatterplot in which the presence of an outlier decreases the observed correlation between the response and explanatory variables. Indicate on your plot which point is the outlier.

Anish Buchanan 2020-11-05

### For a variable that is normally distributed with a mean of 50 and a standard deviation of 5, approximately _? of the scores are between _?. A)95%, 45 and 55 B)95%, 40 and 60 C)68%, 40 and 60 D)95%, 35 and 65 E)99%, 40 and 60

Efan Halliday 2020-11-05

### Suppose Z, the random variable, has a normal distribution, calculate the following probabilities (Round to two decimal places)a)$P\left(z>1.9\right)$b)$P\left(-2\le z\le 1.2\right)$c)$P\left(z\ge 0.2\right)$

Study design Answered
Nannie Mack 2020-11-05

### Regarding observational studies and designed experiments: a. Describe each type of statistical study. b. With respect to possible conclusions, what important difference exists between these two types of statistical studies?

Probability Answered
hexacordoK 2020-11-03

### How many 3-letter combinations of the letters in the word EIGHT are possible?

Probability Answered
BolkowN 2020-11-03

### A business traveler has five shirts, four pairs of pants, and two jackets in his closet. How many possible outfits, consisting of a shirt, a pair of pants, and a jacket, could he wear?

Scatterplots Answered
pedzenekO 2020-11-02

### We have to explain the relationship between employee performance 01 and employee performance 02 using the scater plot

Study design Answered
Tolnaio 2020-11-01

### 1.An investigator wants to assess whether the use of a specific medication given to infants born prematurely is associated with developmental delay. Infants who were born prematurely are recruited and followed for 2-years. Some of the infants were given the medication at birth and others were not. All infants will undergo extensive testing at age 2 to assess various aspects of development. What type of study design: The Case Report/Case Series, The Cross-Sectional Survey, The Cohort Study, The Case Control Study, The Nested Case-Control Study, The Randomized Controlled Trial or The Crossover Trial?

Anonym 2020-11-01

### State the criteria for a binomial probability experiment.

Scatterplots Answered
waigaK 2020-11-01

### The value of s alone doesn't reveal information about the form of an association. Sketch a scatterplot showing a nonlinear association with a small value of s and a second scatterplot showing a linear association with a large value of s.

Study design Answered
nitraiddQ 2020-11-01

### An investigator wants to test whether exposure to secondhand smoke before 1 year of life is associated with development of childhood asthma (defined as asthma diagnosed before 5 years of age). Give two possible study designs.

Scatterplots Answered
Anish Buchanan 2020-11-01

### Sketch a scatterplot showing data for which the correlation is [r = -1].

sjeikdom0 2020-11-01

### Answer true or false to each statement. Explain your answers. a. Two normal distributions that have the same mean are centered at the same place, regardless of the relationship between their standard deviations. b. Two normal distributions that have the same standard deviation have the same spread, regardless of the relationship between their means.

SchachtN 2020-11-01

### Please, convert the binomial probability to a normal distribution probability using continuity correction. P (x = 33).

Study design Answered
pedzenekO 2020-10-31

### Describe the Process design phase?

Scatterplots Answered
Phoebe 2020-10-31

### Which set of ordered pairs could be generated by an exponential function? A. $\left(-1,-\frac{1}{2}\right)$, (0, 0),$\left(1,\frac{1}{2}\right)$, (2, 1) B. (–1, –1), (0, 0), (1, 1), (2, 8) C. $\left(-1,\frac{1}{2}\right)$, (0, 1), (1, 2), (2, 4) D. (–1, 1), (0, 0), (1, 1), (2, 4)

Study design Answered
foass77W 2020-10-28

### Which of the following claims about cohort and case-control studies is true, and which ones are false?(I) Case-control studies are controlled experiments, whilst cohort studies are observational studies. (II) Case-control studies are better for rare diseases, compared to cohort studies.

Probability Answered
glamrockqueen7 2020-10-28

### A teacher placed thexample 1 ) U, and WW in a bag. A card is drawn at random. Determine the theoretical probability for drawing a card that has a vowel on it. (Example 2 )

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