Category Bahan Kuliah Statistics

Apa Sih Business Statistics Itu?

Hmmm…mungkin banyak dari kamu sekalian yang berfikir  kalo statistics itu identik dengan melulu angka, big numbers, count a lot, counting and counting

Benarkah seperti itu??

Ternyata setiap hari, kita sangat dekat loh dengan statistics..

Banyak orang yang sengaja menonton acara perkiraan cuaca terbaru untuk menentukan setelan baju apa yang harus mereka pakai..

Kalau hari akan turun hujan, kemungkinan banyak pengendara motor yang mempersiapkan jas hujan ketika hendak bepergian

Kalau hari diperkirakan akan panas, mungkin banyak orang yang memilih memakai baju berbahan nyaman dan tipis ketimbang memakai jaket tebal

Atau kalau kalian yang hidup di kota besar dan selalu dihantui kemacetan, mungkin sebelum berangkat banyak yang memilih membuka aplikasi yang membantu menentukan rute ter...

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Exercise Chp Basic Probability:

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Exercise Chp Normal Distribution

A set of final examination grades in an introductory statistics course is normally distributed, with a mean of 73 and a standard deviation of 8.

a.What is the probability of getting a grade below 91 on this exam?

b.What is the probability that a student scored between 65 and 89?

c.The probability is 5% that a student taking the test scores higher than what grade?

d.If the professor grades on a curve (that is, gives As to the top 10% of the class, regardless  of the score), are you better off with a grade of 81 on this exam or a grade of 68 on a different exam, where the mean is 62 and the standard deviation is 3? Show your answer statistically and explain.

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Exercise Chp Basic Probability: The Wall Street Journal

The broadcast networks introduce new television shows each fall. In an attempt to get viewers interested in the new shows, television commercials are aired during the summer as part of promotional campaign conducted prior to the fall debuts. The networks then conduct surveys to see what percentage of the viewing public is aware of the shows. According to network sources, in the fall of 2001, 68% of viewers aged 18-49 were aware of the new series Criminal Intent, whereas only 24% of viewers aged 18-49 were aware of Inside Schwatz (Joe Flint, “Viewers Awareness of New Shows Rises,” The Wall Street Journal, August 20, 2001, B7).

  • Suppose that a random sample of 20 viewers aged 18-49 is selected. What is the probability that:Less than five of the viewers are aware of Criminal Intent?
  • Are t...
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Central Tendency 2 Camera

The Cost of 14 models of 15-megapixel digital cameras at a camera specialty store during 2014 was as follows.

340         450         450         280         220         340         290

370         400         310         340         430         270         380


  1. Compute the mean, median, first quartile and third quartile
  2. Compute the range, interquartile range, variance, standard deviation and a coefficient of variation
  3. Based on the result what conclusions can you reach concerning the price of 15-megapixel digital cameras at a camera specialty store during 2014?
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Central Tendency 1 SBLI

In New York State, savings banks are permitted to sell a form of life insurance called Savings Bank Life Insurance (SBLI). The approval process consists of underwritting, which includes a review of the application, a medical information bureau check, possible requests for additional medical information and medical exams, and a policy compilation stage during which the policy pages are generated and sent to the bank for delivery. The ability to deliver approved policies to customers in a timely manner is critical to the profitability of this service to the bank. During a period of one month, a random sample of 25 approved policies was selected and the following total processing time in days was recorded.

73           19           16           64           28           28           31       ...

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Business Statistics Chapter 2 Frequency and Percentage Distributions

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Chapter 10 Soal ANOVA


The data below represent the lifetime of four different alloys.


1 2 3 4
999 1022 1026 974
1010 973 1008 1015
995 1023 1005 1009
998 1023 1007 1011
1001 996 981 995


  1. At the 0.05 level of significance, is there evidence of a difference in the mean lifetime of the four alloys?
  2. If appropriate, determine which alloys differ in mean lifetime.
  3. At the 0.05 level of significance, is there evidence of a difference in the variation in lifetime among the four alloys?
  4. What effect does your result in (c) have on the validity of the results in (a) and (b


The retailing manager of a supermarket chain wants to determine whether product location has any effect on ...

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