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Under which condition is it appropriate to approximate a binomial distribution to a normal distribution when conducting a test of hypothesis for a population proportion? The sample size is small, regardless of the population proportion. The sample size is large, and both np and n(1−p) are greater than 10. The population proportion is close to 0.5. The population standard deviation (σ) is unknown. Answer should be 1, 2, 3 or 4

A manufacture company claims that the average lifetime of a battery is 2 years with a standard deviation of 0.3 years . To check the claim a engineering firm picks a random sample of 15 batteries and finds the mean lifetime is 1.8 years. Which distribution you are going to use for the test of hypothesis? A. Case I – Normal distribution B. Case II – Normal distribution C. Case III – t-distribution Answer should be A, B or C

When Charlemagne’s empire faltered, decentralization of political power — feudalism — rose to replace it.

The average lifetime of a battery is  at most 1000 hours.  What will be the Null and Alternative hypothesis? Null µ = 1000, Alternative µ ≥ 1000 Null µ > 1000, Alternative µ ≤ 1000  Null µ  ≥ 1000, Alternative µ < 1000 Null µ ≤ 1000, Alternative µ > 1000 Answer should be 1, 2, 3 or 4

“战利品箱”是一种让玩家花钱却不知道能获得什么的机制。

塔米宁教授认为，睡眠对学习的最大作用是什么？

游戏公司为什么大力推广微交易？

Dr. Wassarman discovered a genetic suppressor of A-T in his dominant modifier screen. What is the genotype of the suppressor? Choose the letter that corresponds to the correct genotype below.  A. stringmutant / stringwild-type (non-mutant) B. stringmutant / stringmutant C. stringwild-type (non-mutant) / stringwild-type (non-mutant) D. P35mutant / P35wild-type (non-mutant) E. P35mutant / P35mutant   Be careful when you mark your selection because the order of the letters might be mixed-up!

In Fragile X Syndrome there is [increased] protein synthesis downstream of mGluR activation. One mRNA whose translation is normally regulated by FMRP is [arc]. In Fragile X Syndrome the aberrant translation of this mRNA leads to an excess of [internalization] and [depression].  

Select True or False for each statement below. The microsatellite expansion in TDP-43 might disrupt its nucleocytoplasmic transport causing it to build-up in the cytoplasm. [false1] Mutations in the prion-like domain of C9orf72 that cause familial ALS increase its propensity to form insoluble protein aggregates. [false2] Ribonucleoprotein granules always contain mRNA. [true1] Ribonucleoprotein granules are dynamic structures that primarily form by liquid-liquid phase separation. [true2]